Solve for x
x=40
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180-4x-20=0
Combine -3x and -x to get -4x.
160-4x=0
Subtract 20 from 180 to get 160.
-4x=-160
Subtract 160 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-160}{-4}
Divide both sides by -4.
x=40
Divide -160 by -4 to get 40.
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