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40=9y-y
We move all terms to the left:
40-(9y-y)=0
We add all the numbers together, and all the variables
-(+8y)+40=0
We get rid of parentheses
-8y+40=0
We move all terms containing y to the left, all other terms to the right
-8y=-40
y=-40/-8
y=+5
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