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40=3y+y
We move all terms to the left:
40-(3y+y)=0
We add all the numbers together, and all the variables
-(+4y)+40=0
We get rid of parentheses
-4y+40=0
We move all terms containing y to the left, all other terms to the right
-4y=-40
y=-40/-4
y=+10
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