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(7x-4)+(12x+13)=180
We move all terms to the left:
(7x-4)+(12x+13)-(180)=0
We get rid of parentheses
7x+12x-4+13-180=0
We add all the numbers together, and all the variables
19x-171=0
We move all terms containing x to the left, all other terms to the right
19x=171
x=171/19
x=9
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