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