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(7x+81)+(12x+36)=180
We move all terms to the left:
(7x+81)+(12x+36)-(180)=0
We get rid of parentheses
7x+12x+81+36-180=0
We add all the numbers together, and all the variables
19x-63=0
We move all terms containing x to the left, all other terms to the right
19x=63
x=63/19
x=3+6/19
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