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(2x+55)+(7x+25)=180
We move all terms to the left:
(2x+55)+(7x+25)-(180)=0
We get rid of parentheses
2x+7x+55+25-180=0
We add all the numbers together, and all the variables
9x-100=0
We move all terms containing x to the left, all other terms to the right
9x=100
x=100/9
x=11+1/9
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