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(12x)+(43x-40)=180
We move all terms to the left:
(12x)+(43x-40)-(180)=0
We get rid of parentheses
12x+43x-40-180=0
We add all the numbers together, and all the variables
55x-220=0
We move all terms containing x to the left, all other terms to the right
55x=220
x=220/55
x=4
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