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10y+40=15y-40
We move all terms to the left:
10y+40-(15y-40)=0
We get rid of parentheses
10y-15y+40+40=0
We add all the numbers together, and all the variables
-5y+80=0
We move all terms containing y to the left, all other terms to the right
-5y=-80
y=-80/-5
y=+16
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