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(12x-7)+(9x+14)=180
We move all terms to the left:
(12x-7)+(9x+14)-(180)=0
We get rid of parentheses
12x+9x-7+14-180=0
We add all the numbers together, and all the variables
21x-173=0
We move all terms containing x to the left, all other terms to the right
21x=173
x=173/21
x=8+5/21
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