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(x+11)+(2x+1)=180
We move all terms to the left:
(x+11)+(2x+1)-(180)=0
We get rid of parentheses
x+2x+11+1-180=0
We add all the numbers together, and all the variables
3x-168=0
We move all terms containing x to the left, all other terms to the right
3x=168
x=168/3
x=56
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