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(x+45)+(42x-34)+(28x+27)=180
We move all terms to the left:
(x+45)+(42x-34)+(28x+27)-(180)=0
We get rid of parentheses
x+42x+28x+45-34+27-180=0
We add all the numbers together, and all the variables
71x-142=0
We move all terms containing x to the left, all other terms to the right
71x=142
x=142/71
x=2
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