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288=20x+2(x)(x)
We move all terms to the left:
288-(20x+2(x)(x))=0
We add all the numbers together, and all the variables
-(+20x+2xx)+288=0
We get rid of parentheses
-20x-2xx+288=0
We move all terms containing x to the left, all other terms to the right
-20x-2xx=-288
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