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(x+42)+2x=90
We move all terms to the left:
(x+42)+2x-(90)=0
We add all the numbers together, and all the variables
2x+(x+42)-90=0
We get rid of parentheses
2x+x+42-90=0
We add all the numbers together, and all the variables
3x-48=0
We move all terms containing x to the left, all other terms to the right
3x=48
x=48/3
x=16
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