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(12x+7)+(13x+2)=180
We move all terms to the left:
(12x+7)+(13x+2)-(180)=0
We get rid of parentheses
12x+13x+7+2-180=0
We add all the numbers together, and all the variables
25x-171=0
We move all terms containing x to the left, all other terms to the right
25x=171
x=171/25
x=6+21/25
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