Solve for x
x=-10
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20+2x=0
Variable x cannot be equal to 5 since division by zero is not defined. Multiply both sides of the equation by -x+5.
2x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-20}{2}
Divide both sides by 2.
x=-10
Divide -20 by 2 to get -10.
Examples
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Linear equation
y = 3x + 4
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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
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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