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(2x+7)+(9x+3)=180
We move all terms to the left:
(2x+7)+(9x+3)-(180)=0
We get rid of parentheses
2x+9x+7+3-180=0
We add all the numbers together, and all the variables
11x-170=0
We move all terms containing x to the left, all other terms to the right
11x=170
x=170/11
x=15+5/11
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