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51=9-3y
We move all terms to the left:
51-(9-3y)=0
We add all the numbers together, and all the variables
-(-3y+9)+51=0
We get rid of parentheses
3y-9+51=0
We add all the numbers together, and all the variables
3y+42=0
We move all terms containing y to the left, all other terms to the right
3y=-42
y=-42/3
y=-14
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