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(5x-7)+(9x+19)=180
We move all terms to the left:
(5x-7)+(9x+19)-(180)=0
We get rid of parentheses
5x+9x-7+19-180=0
We add all the numbers together, and all the variables
14x-168=0
We move all terms containing x to the left, all other terms to the right
14x=168
x=168/14
x=12
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