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(12x-7)+(16x+19)=180
We move all terms to the left:
(12x-7)+(16x+19)-(180)=0
We get rid of parentheses
12x+16x-7+19-180=0
We add all the numbers together, and all the variables
28x-168=0
We move all terms containing x to the left, all other terms to the right
28x=168
x=168/28
x=6
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