Solve for x
x=99
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x+30=129
Multiply both sides of the equation by 3.
x=129-30
Subtract 30 from both sides.
x=99
Subtract 30 from 129 to get 99.
Examples
Quadratic equation
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Linear equation
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Matrix
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Simultaneous equation
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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