Solve for Q
Q=20
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80-2Q=40
Swap sides so that all variable terms are on the left hand side.
-2Q=40-80
Subtract 80 from both sides.
-2Q=-40
Subtract 80 from 40 to get -40.
Q=\frac{-40}{-2}
Divide both sides by -2.
Q=20
Divide -40 by -2 to get 20.
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