Solve for x
x=10
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20-x-x=0
Subtract x from both sides.
20-2x=0
Combine -x and -x to get -2x.
-2x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-20}{-2}
Divide both sides by -2.
x=10
Divide -20 by -2 to get 10.
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