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(5x+8)+(3x+12)=180
We move all terms to the left:
(5x+8)+(3x+12)-(180)=0
We get rid of parentheses
5x+3x+8+12-180=0
We add all the numbers together, and all the variables
8x-160=0
We move all terms containing x to the left, all other terms to the right
8x=160
x=160/8
x=20
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