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(5y-9)+90=8y+42
We move all terms to the left:
(5y-9)+90-(8y+42)=0
We get rid of parentheses
5y-8y-9-42+90=0
We add all the numbers together, and all the variables
-3y+39=0
We move all terms containing y to the left, all other terms to the right
-3y=-39
y=-39/-3
y=+13
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