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(x+57)+(x-15)+x=180
We move all terms to the left:
(x+57)+(x-15)+x-(180)=0
We add all the numbers together, and all the variables
x+(x+57)+(x-15)-180=0
We get rid of parentheses
x+x+x+57-15-180=0
We add all the numbers together, and all the variables
3x-138=0
We move all terms containing x to the left, all other terms to the right
3x=138
x=138/3
x=46
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