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(8x+7)+(12x+57)=180
We move all terms to the left:
(8x+7)+(12x+57)-(180)=0
We get rid of parentheses
8x+12x+7+57-180=0
We add all the numbers together, and all the variables
20x-116=0
We move all terms containing x to the left, all other terms to the right
20x=116
x=116/20
x=5+4/5
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