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(7x+15)+(5x-3)=180
We move all terms to the left:
(7x+15)+(5x-3)-(180)=0
We get rid of parentheses
7x+5x+15-3-180=0
We add all the numbers together, and all the variables
12x-168=0
We move all terms containing x to the left, all other terms to the right
12x=168
x=168/12
x=14
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