Solve for x
x=180
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180+x+x=3x
Add 90 and 90 to get 180.
180+2x=3x
Combine x and x to get 2x.
180+2x-3x=0
Subtract 3x from both sides.
180-x=0
Combine 2x and -3x to get -x.
-x=-180
Subtract 180 from both sides. Anything subtracted from zero gives its negation.
x=180
Multiply both sides by -1.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
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Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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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