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(2x+3)+(13x+12)=180
We move all terms to the left:
(2x+3)+(13x+12)-(180)=0
We get rid of parentheses
2x+13x+3+12-180=0
We add all the numbers together, and all the variables
15x-165=0
We move all terms containing x to the left, all other terms to the right
15x=165
x=165/15
x=11
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