Solve for x
x = \frac{39}{5} = 7\frac{4}{5} = 7.8
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x-\frac{21}{6}-\frac{4}{6}=\frac{2}{3}\left(\frac{3}{4}x-\frac{2}{5}\right)
Least common multiple of 2 and 3 is 6. Convert -\frac{7}{2} and \frac{2}{3} to fractions with denominator 6.
x+\frac{-21-4}{6}=\frac{2}{3}\left(\frac{3}{4}x-\frac{2}{5}\right)
Since -\frac{21}{6} and \frac{4}{6} have the same denominator, subtract them by subtracting their numerators.
x-\frac{25}{6}=\frac{2}{3}\left(\frac{3}{4}x-\frac{2}{5}\right)
Subtract 4 from -21 to get -25.
x-\frac{25}{6}=\frac{2}{3}\times \frac{3}{4}x+\frac{2}{3}\left(-\frac{2}{5}\right)
Use the distributive property to multiply \frac{2}{3} by \frac{3}{4}x-\frac{2}{5}.
x-\frac{25}{6}=\frac{2\times 3}{3\times 4}x+\frac{2}{3}\left(-\frac{2}{5}\right)
Multiply \frac{2}{3} times \frac{3}{4} by multiplying numerator times numerator and denominator times denominator.
x-\frac{25}{6}=\frac{2}{4}x+\frac{2}{3}\left(-\frac{2}{5}\right)
Cancel out 3 in both numerator and denominator.
x-\frac{25}{6}=\frac{1}{2}x+\frac{2}{3}\left(-\frac{2}{5}\right)
Reduce the fraction \frac{2}{4} to lowest terms by extracting and canceling out 2.
x-\frac{25}{6}=\frac{1}{2}x+\frac{2\left(-2\right)}{3\times 5}
Multiply \frac{2}{3} times -\frac{2}{5} by multiplying numerator times numerator and denominator times denominator.
x-\frac{25}{6}=\frac{1}{2}x+\frac{-4}{15}
Do the multiplications in the fraction \frac{2\left(-2\right)}{3\times 5}.
x-\frac{25}{6}=\frac{1}{2}x-\frac{4}{15}
Fraction \frac{-4}{15} can be rewritten as -\frac{4}{15} by extracting the negative sign.
x-\frac{25}{6}-\frac{1}{2}x=-\frac{4}{15}
Subtract \frac{1}{2}x from both sides.
\frac{1}{2}x-\frac{25}{6}=-\frac{4}{15}
Combine x and -\frac{1}{2}x to get \frac{1}{2}x.
\frac{1}{2}x=-\frac{4}{15}+\frac{25}{6}
Add \frac{25}{6} to both sides.
\frac{1}{2}x=-\frac{8}{30}+\frac{125}{30}
Least common multiple of 15 and 6 is 30. Convert -\frac{4}{15} and \frac{25}{6} to fractions with denominator 30.
\frac{1}{2}x=\frac{-8+125}{30}
Since -\frac{8}{30} and \frac{125}{30} have the same denominator, add them by adding their numerators.
\frac{1}{2}x=\frac{117}{30}
Add -8 and 125 to get 117.
\frac{1}{2}x=\frac{39}{10}
Reduce the fraction \frac{117}{30} to lowest terms by extracting and canceling out 3.
x=\frac{39}{10}\times 2
Multiply both sides by 2, the reciprocal of \frac{1}{2}.
x=\frac{39\times 2}{10}
Express \frac{39}{10}\times 2 as a single fraction.
x=\frac{78}{10}
Multiply 39 and 2 to get 78.
x=\frac{39}{5}
Reduce the fraction \frac{78}{10} to lowest terms by extracting and canceling out 2.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}