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9y=2y+31
We move all terms to the left:
9y-(2y+31)=0
We get rid of parentheses
9y-2y-31=0
We add all the numbers together, and all the variables
7y-31=0
We move all terms containing y to the left, all other terms to the right
7y=31
y=31/7
y=4+3/7
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