Solve for x
x=-1
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\frac{12}{3}=3-x
Divide both sides by 3.
4=3-x
Divide 12 by 3 to get 4.
3-x=4
Swap sides so that all variable terms are on the left hand side.
-x=4-3
Subtract 3 from both sides.
-x=1
Subtract 3 from 4 to get 1.
x=-1
Multiply both sides by -1.
Examples
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Linear equation
y = 3x + 4
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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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