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(9x-55)+(3x+35)=180
We move all terms to the left:
(9x-55)+(3x+35)-(180)=0
We get rid of parentheses
9x+3x-55+35-180=0
We add all the numbers together, and all the variables
12x-200=0
We move all terms containing x to the left, all other terms to the right
12x=200
x=200/12
x=16+2/3
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