Solve for x
x=78
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x-13=65
Subtract 15 from 2 to get -13.
x=65+13
Add 13 to both sides.
x=78
Add 65 and 13 to get 78.
Examples
Quadratic equation
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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
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Limits
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