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(15x)+(18x-12)+(10x+20)=180
We move all terms to the left:
(15x)+(18x-12)+(10x+20)-(180)=0
We get rid of parentheses
15x+18x+10x-12+20-180=0
We add all the numbers together, and all the variables
43x-172=0
We move all terms containing x to the left, all other terms to the right
43x=172
x=172/43
x=4
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