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