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21=9-y
We move all terms to the left:
21-(9-y)=0
We add all the numbers together, and all the variables
-(-1y+9)+21=0
We get rid of parentheses
1y-9+21=0
We add all the numbers together, and all the variables
y+12=0
We move all terms containing y to the left, all other terms to the right
y=-12
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