91=10y-9

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Solution for 91=10y-9 equation: 



91=10y-9

We move all terms to the left:

91-(10y-9)=0

We get rid of parentheses

-10y+9+91=0

We add all the numbers together, and all the variables

-10y+100=0

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

-10y=-100

y=-100/-10

y=+10

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