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-y=-9y-15
We move all terms to the left:
-y-(-9y-15)=0
We add all the numbers together, and all the variables
-1y-(-9y-15)=0
We get rid of parentheses
-1y+9y+15=0
We add all the numbers together, and all the variables
8y+15=0
We move all terms containing y to the left, all other terms to the right
8y=-15
y=-15/8
y=-1+7/8
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