Solve for x
x=-3
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12x+20+9x-20=-63
Combine x^{2} and -x^{2} to get 0.
21x+20-20=-63
Combine 12x and 9x to get 21x.
21x=-63
Subtract 20 from 20 to get 0.
x=\frac{-63}{21}
Divide both sides by 21.
x=-3
Divide -63 by 21 to get -3.
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