Solve for x
x=2
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2x+5=9
Square both sides of the equation.
2x+5-5=9-5
Subtract 5 from both sides of the equation.
2x=9-5
Subtracting 5 from itself leaves 0.
2x=4
Subtract 5 from 9.
\frac{2x}{2}=\frac{4}{2}
Divide both sides by 2.
x=\frac{4}{2}
Dividing by 2 undoes the multiplication by 2.
x=2
Divide 4 by 2.
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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