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(9x+28)+(3x+38)=90
We move all terms to the left:
(9x+28)+(3x+38)-(90)=0
We get rid of parentheses
9x+3x+28+38-90=0
We add all the numbers together, and all the variables
12x-24=0
We move all terms containing x to the left, all other terms to the right
12x=24
x=24/12
x=2
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