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9(y+-2)+4=31
We move all terms to the left:
9(y+-2)+4-(31)=0
We add all the numbers together, and all the variables
9(y-2)+4-31=0
We add all the numbers together, and all the variables
9(y-2)-27=0
We multiply parentheses
9y-18-27=0
We add all the numbers together, and all the variables
9y-45=0
We move all terms containing y to the left, all other terms to the right
9y=45
y=45/9
y=5
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