Solve for y
y=40
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-2y+80=0
Combine 2y and -4y to get -2y.
-2y=-80
Subtract 80 from both sides. Anything subtracted from zero gives its negation.
y=\frac{-80}{-2}
Divide both sides by -2.
y=40
Divide -80 by -2 to get 40.
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