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-31=-y/9
We move all terms to the left:
-31-(-y/9)=0
We get rid of parentheses
y/9-31=0
We multiply all the terms by the denominator
y-31*9=0
We add all the numbers together, and all the variables
y-279=0
We move all terms containing y to the left, all other terms to the right
y=279
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