Solve for x
x=-3
Graph
Share
Copied to clipboard
\frac{5\times 4x}{15}-\frac{3\left(x-2\right)}{15}=x
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 3 and 5 is 15. Multiply \frac{4x}{3} times \frac{5}{5}. Multiply \frac{x-2}{5} times \frac{3}{3}.
\frac{5\times 4x-3\left(x-2\right)}{15}=x
Since \frac{5\times 4x}{15} and \frac{3\left(x-2\right)}{15} have the same denominator, subtract them by subtracting their numerators.
\frac{20x-3x+6}{15}=x
Do the multiplications in 5\times 4x-3\left(x-2\right).
\frac{17x+6}{15}=x
Combine like terms in 20x-3x+6.
\frac{17}{15}x+\frac{2}{5}=x
Divide each term of 17x+6 by 15 to get \frac{17}{15}x+\frac{2}{5}.
\frac{17}{15}x+\frac{2}{5}-x=0
Subtract x from both sides.
\frac{2}{15}x+\frac{2}{5}=0
Combine \frac{17}{15}x and -x to get \frac{2}{15}x.
\frac{2}{15}x=-\frac{2}{5}
Subtract \frac{2}{5} from both sides. Anything subtracted from zero gives its negation.
x=-\frac{2}{5}\times \frac{15}{2}
Multiply both sides by \frac{15}{2}, the reciprocal of \frac{2}{15}.
x=\frac{-2\times 15}{5\times 2}
Multiply -\frac{2}{5} times \frac{15}{2} by multiplying numerator times numerator and denominator times denominator.
x=\frac{-30}{10}
Do the multiplications in the fraction \frac{-2\times 15}{5\times 2}.
x=-3
Divide -30 by 10 to get -3.
Examples
Quadratic equation
{ 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}