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(12x+3)+(7x-13)=180
We move all terms to the left:
(12x+3)+(7x-13)-(180)=0
We get rid of parentheses
12x+7x+3-13-180=0
We add all the numbers together, and all the variables
19x-190=0
We move all terms containing x to the left, all other terms to the right
19x=190
x=190/19
x=10
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