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(5x+42)+(8x-15)=180
We move all terms to the left:
(5x+42)+(8x-15)-(180)=0
We get rid of parentheses
5x+8x+42-15-180=0
We add all the numbers together, and all the variables
13x-153=0
We move all terms containing x to the left, all other terms to the right
13x=153
x=153/13
x=11+10/13
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