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(x+11)+(3x-21)=180
We move all terms to the left:
(x+11)+(3x-21)-(180)=0
We get rid of parentheses
x+3x+11-21-180=0
We add all the numbers together, and all the variables
4x-190=0
We move all terms containing x to the left, all other terms to the right
4x=190
x=190/4
x=47+1/2
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