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(3x+12)+(7x+32)=180
We move all terms to the left:
(3x+12)+(7x+32)-(180)=0
We get rid of parentheses
3x+7x+12+32-180=0
We add all the numbers together, and all the variables
10x-136=0
We move all terms containing x to the left, all other terms to the right
10x=136
x=136/10
x=13+3/5
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