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(x+11)+(x+7)+(x+4)=180
We move all terms to the left:
(x+11)+(x+7)+(x+4)-(180)=0
We get rid of parentheses
x+x+x+11+7+4-180=0
We add all the numbers together, and all the variables
3x-158=0
We move all terms containing x to the left, all other terms to the right
3x=158
x=158/3
x=52+2/3
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