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(42+x)=180
We move all terms to the left:
(42+x)-(180)=0
We add all the numbers together, and all the variables
(x+42)-180=0
We get rid of parentheses
x+42-180=0
We add all the numbers together, and all the variables
x-138=0
We move all terms containing x to the left, all other terms to the right
x=138
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