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(2+x)(x)(1-2x)=168
We move all terms to the left:
(2+x)(x)(1-2x)-(168)=0
We add all the numbers together, and all the variables
(x+2)x(-2x+1)-168=0
We move all terms containing x to the left, all other terms to the right
(x+2)x(-2x+1)=168
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