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4x^2(x-3)=3x+x-12
We move all terms to the left:
4x^2(x-3)-(3x+x-12)=0
We add all the numbers together, and all the variables
4x^2(x-3)-(4x-12)=0
We get rid of parentheses
4x^2(x-3)-4x+12=0
We move all terms containing x to the left, all other terms to the right
4x^2(x-3)-4x=-12
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