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31=6y+7
We move all terms to the left:
31-(6y+7)=0
We get rid of parentheses
-6y-7+31=0
We add all the numbers together, and all the variables
-6y+24=0
We move all terms containing y to the left, all other terms to the right
-6y=-24
y=-24/-6
y=+4
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