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(7x-11)+(5x-1)+(3x+12)=180
We move all terms to the left:
(7x-11)+(5x-1)+(3x+12)-(180)=0
We get rid of parentheses
7x+5x+3x-11-1+12-180=0
We add all the numbers together, and all the variables
15x-180=0
We move all terms containing x to the left, all other terms to the right
15x=180
x=180/15
x=12
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