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(x+42)+3x=180
We move all terms to the left:
(x+42)+3x-(180)=0
We add all the numbers together, and all the variables
3x+(x+42)-180=0
We get rid of parentheses
3x+x+42-180=0
We add all the numbers together, and all the variables
4x-138=0
We move all terms containing x to the left, all other terms to the right
4x=138
x=138/4
x=34+1/2
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