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-40=y-
We move all terms to the left:
-40-(y-)=0
We add all the numbers together, and all the variables
-(+y)-40=0
We get rid of parentheses
-y-40=0
We add all the numbers together, and all the variables
-1y-40=0
We move all terms containing y to the left, all other terms to the right
-y=40
y=40/-1
y=-40
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