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(x+9)+(4x+11)+(x+13)=180
We move all terms to the left:
(x+9)+(4x+11)+(x+13)-(180)=0
We get rid of parentheses
x+4x+x+9+11+13-180=0
We add all the numbers together, and all the variables
6x-147=0
We move all terms containing x to the left, all other terms to the right
6x=147
x=147/6
x=24+1/2
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