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(4x+3)+(7x+12)=180
We move all terms to the left:
(4x+3)+(7x+12)-(180)=0
We get rid of parentheses
4x+7x+3+12-180=0
We add all the numbers together, and all the variables
11x-165=0
We move all terms containing x to the left, all other terms to the right
11x=165
x=165/11
x=15
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