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(x+28)+(4x-8)=90
We move all terms to the left:
(x+28)+(4x-8)-(90)=0
We get rid of parentheses
x+4x+28-8-90=0
We add all the numbers together, and all the variables
5x-70=0
We move all terms containing x to the left, all other terms to the right
5x=70
x=70/5
x=14
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