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(12x+4)+(15x-8)=180
We move all terms to the left:
(12x+4)+(15x-8)-(180)=0
We get rid of parentheses
12x+15x+4-8-180=0
We add all the numbers together, and all the variables
27x-184=0
We move all terms containing x to the left, all other terms to the right
27x=184
x=184/27
x=6+22/27
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