Solve for x
x=\frac{1}{21}\approx 0.047619048
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8x-2x+x+1=28x
Multiply both sides of the equation by 4, the least common multiple of 2,4.
6x+x+1=28x
Combine 8x and -2x to get 6x.
7x+1=28x
Combine 6x and x to get 7x.
7x+1-28x=0
Subtract 28x from both sides.
-21x+1=0
Combine 7x and -28x to get -21x.
-21x=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-1}{-21}
Divide both sides by -21.
x=\frac{1}{21}
Fraction \frac{-1}{-21} can be simplified to \frac{1}{21} by removing the negative sign from both the numerator and the denominator.
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}