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(5x-7)+(4x+15)=180
We move all terms to the left:
(5x-7)+(4x+15)-(180)=0
We get rid of parentheses
5x+4x-7+15-180=0
We add all the numbers together, and all the variables
9x-172=0
We move all terms containing x to the left, all other terms to the right
9x=172
x=172/9
x=19+1/9
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