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9=3y+30
We move all terms to the left:
9-(3y+30)=0
We get rid of parentheses
-3y-30+9=0
We add all the numbers together, and all the variables
-3y-21=0
We move all terms containing y to the left, all other terms to the right
-3y=21
y=21/-3
y=-7
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