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(12x-13)+(17x-13)=180
We move all terms to the left:
(12x-13)+(17x-13)-(180)=0
We get rid of parentheses
12x+17x-13-13-180=0
We add all the numbers together, and all the variables
29x-206=0
We move all terms containing x to the left, all other terms to the right
29x=206
x=206/29
x=7+3/29
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