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90=2y+8y
We move all terms to the left:
90-(2y+8y)=0
We add all the numbers together, and all the variables
-(+10y)+90=0
We get rid of parentheses
-10y+90=0
We move all terms containing y to the left, all other terms to the right
-10y=-90
y=-90/-10
y=+9
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