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