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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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