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40-7y=3y-10
We move all terms to the left:
40-7y-(3y-10)=0
We get rid of parentheses
-7y-3y+10+40=0
We add all the numbers together, and all the variables
-10y+50=0
We move all terms containing y to the left, all other terms to the right
-10y=-50
y=-50/-10
y=+5
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