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(15x-20)+(12x-16)=180
We move all terms to the left:
(15x-20)+(12x-16)-(180)=0
We get rid of parentheses
15x+12x-20-16-180=0
We add all the numbers together, and all the variables
27x-216=0
We move all terms containing x to the left, all other terms to the right
27x=216
x=216/27
x=8
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