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-3y-40=-8y
We move all terms to the left:
-3y-40-(-8y)=0
We get rid of parentheses
-3y+8y-40=0
We add all the numbers together, and all the variables
5y-40=0
We move all terms containing y to the left, all other terms to the right
5y=40
y=40/5
y=8
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