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(6x+12)+(3x-3)=180
We move all terms to the left:
(6x+12)+(3x-3)-(180)=0
We get rid of parentheses
6x+3x+12-3-180=0
We add all the numbers together, and all the variables
9x-171=0
We move all terms containing x to the left, all other terms to the right
9x=171
x=171/9
x=19
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