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(2+x)*3=90
We move all terms to the left:
(2+x)*3-(90)=0
We add all the numbers together, and all the variables
(x+2)*3-90=0
We multiply parentheses
3x+6-90=0
We add all the numbers together, and all the variables
3x-84=0
We move all terms containing x to the left, all other terms to the right
3x=84
x=84/3
x=28
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