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(2x-111)+(x+9)=180
We move all terms to the left:
(2x-111)+(x+9)-(180)=0
We get rid of parentheses
2x+x-111+9-180=0
We add all the numbers together, and all the variables
3x-282=0
We move all terms containing x to the left, all other terms to the right
3x=282
x=282/3
x=94
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