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(2x+12)+(5x-9)=180
We move all terms to the left:
(2x+12)+(5x-9)-(180)=0
We get rid of parentheses
2x+5x+12-9-180=0
We add all the numbers together, and all the variables
7x-177=0
We move all terms containing x to the left, all other terms to the right
7x=177
x=177/7
x=25+2/7
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