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