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40-20=3y-10
We move all terms to the left:
40-20-(3y-10)=0
We add all the numbers together, and all the variables
-(3y-10)+20=0
We get rid of parentheses
-3y+10+20=0
We add all the numbers together, and all the variables
-3y+30=0
We move all terms containing y to the left, all other terms to the right
-3y=-30
y=-30/-3
y=+10
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