Solve for x
x=42
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2x+42-3x=0
Subtract 3x from both sides.
-x+42=0
Combine 2x and -3x to get -x.
-x=-42
Subtract 42 from both sides. Anything subtracted from zero gives its negation.
x=42
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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