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30+20x-30x=20
Subtract 30x from both sides.
30-10x=20
Combine 20x and -30x to get -10x.
-10x=20-30
Subtract 30 from both sides.
-10x=-10
Subtract 30 from 20 to get -10.
x=\frac{-10}{-10}
Divide both sides by -10.
x=1
Divide -10 by -10 to get 1.