Solve for x
x=-2
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2x-x-2x-8=3x
Use the distributive property to multiply -2 by x+4.
-x-8=3x
Combine 2x and -2x to get 0.
-x-8-3x=0
Subtract 3x from both sides.
-x-3x=8
Add 8 to both sides. Anything plus zero gives itself.
-4x=8
Combine -x and -3x to get -4x.
x=\frac{8}{-4}
Divide both sides by -4.
x=-2
Divide 8 by -4 to get -2.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}