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y=-9+10y
We move all terms to the left:
y-(-9+10y)=0
We add all the numbers together, and all the variables
y-(10y-9)=0
We get rid of parentheses
y-10y+9=0
We add all the numbers together, and all the variables
-9y+9=0
We move all terms containing y to the left, all other terms to the right
-9y=-9
y=-9/-9
y=1
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