Solve for x
x=\frac{2}{5}=0.4
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3+7x-2x=5
Subtract 2x from both sides.
3+5x=5
Combine 7x and -2x to get 5x.
5x=5-3
Subtract 3 from both sides.
5x=2
Subtract 3 from 5 to get 2.
x=\frac{2}{5}
Divide both sides by 5.
Examples
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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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
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