Solve for u
u=-31
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0\times 9=u+31
Multiply both sides of the equation by 3.
0=u+31
Multiply 0 and 9 to get 0.
u+31=0
Swap sides so that all variable terms are on the left hand side.
u=-31
Subtract 31 from both sides. Anything subtracted from zero gives its negation.
Examples
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Linear equation
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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