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27=10y-7y
We move all terms to the left:
27-(10y-7y)=0
We add all the numbers together, and all the variables
-(+3y)+27=0
We get rid of parentheses
-3y+27=0
We move all terms containing y to the left, all other terms to the right
-3y=-27
y=-27/-3
y=+9
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