Solve for x
x=90
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200-2x=20
Swap sides so that all variable terms are on the left hand side.
-2x=20-200
Subtract 200 from both sides.
-2x=-180
Subtract 200 from 20 to get -180.
x=\frac{-180}{-2}
Divide both sides by -2.
x=90
Divide -180 by -2 to get 90.
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