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(x+10)+(3x+28)=90
We move all terms to the left:
(x+10)+(3x+28)-(90)=0
We get rid of parentheses
x+3x+10+28-90=0
We add all the numbers together, and all the variables
4x-52=0
We move all terms containing x to the left, all other terms to the right
4x=52
x=52/4
x=13
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