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(3x-15)2=432
We move all terms to the left:
(3x-15)2-(432)=0
We multiply parentheses
6x-30-432=0
We add all the numbers together, and all the variables
6x-462=0
We move all terms containing x to the left, all other terms to the right
6x=462
x=462/6
x=77
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