Solve for x
x=-5
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-3x-9=-2+8
Combine 2x and -5x to get -3x.
-3x-9=6
Add -2 and 8 to get 6.
-3x=6+9
Add 9 to both sides.
-3x=15
Add 6 and 9 to get 15.
x=\frac{15}{-3}
Divide both sides by -3.
x=-5
Divide 15 by -3 to get -5.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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Linear equation
y = 3x + 4
Arithmetic
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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
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