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(4x+12)/7=(x+3)2
We move all terms to the left:
(4x+12)/7-((x+3)2)=0
We multiply all the terms by the denominator
(4x+12)-(((x+3)2))*7=0
We get rid of parentheses
4x-(((x+3)2))*7+12=0
We move all terms containing x to the left, all other terms to the right
4x-(((x+3)2))*7=-12
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