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(7x-5)+(12x-7)=180
We move all terms to the left:
(7x-5)+(12x-7)-(180)=0
We get rid of parentheses
7x+12x-5-7-180=0
We add all the numbers together, and all the variables
19x-192=0
We move all terms containing x to the left, all other terms to the right
19x=192
x=192/19
x=10+2/19
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