31=10y-9

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Solution for 31=10y-9 equation: 



31=10y-9

We move all terms to the left:

31-(10y-9)=0

We get rid of parentheses

-10y+9+31=0

We add all the numbers together, and all the variables

-10y+40=0

We move all terms containing y to the left, all other terms to the right

-10y=-40

y=-40/-10

y=+4

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