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-9y-6=-8y-7
We move all terms to the left:
-9y-6-(-8y-7)=0
We get rid of parentheses
-9y+8y+7-6=0
We add all the numbers together, and all the variables
-1y+1=0
We move all terms containing y to the left, all other terms to the right
-y=-1
y=-1/-1
y=1
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