Solve for x
x=5
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4x=20
Add 20 to both sides. Anything plus zero gives itself.
x=\frac{20}{4}
Divide both sides by 4.
x=5
Divide 20 by 4 to get 5.
Examples
Quadratic equation
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Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
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Matrix
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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
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Limits
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