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30=y/3+9
We move all terms to the left:
30-(y/3+9)=0
We get rid of parentheses
-y/3-9+30=0
We multiply all the terms by the denominator
-y-9*3+30*3=0
We add all the numbers together, and all the variables
-1y+63=0
We move all terms containing y to the left, all other terms to the right
-y=-63
y=-63/-1
y=+63
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