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(y+4)+(4y-8)=90
We move all terms to the left:
(y+4)+(4y-8)-(90)=0
We get rid of parentheses
y+4y+4-8-90=0
We add all the numbers together, and all the variables
5y-94=0
We move all terms containing y to the left, all other terms to the right
5y=94
y=94/5
y=18+4/5
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