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30=3y-10
We move all terms to the left:
30-(3y-10)=0
We get rid of parentheses
-3y+10+30=0
We add all the numbers together, and all the variables
-3y+40=0
We move all terms containing y to the left, all other terms to the right
-3y=-40
y=-40/-3
y=13+1/3
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