-y-9+3y=-1

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Solution for -y-9+3y=-1 equation: 



-y-9+3y=-1

We move all terms to the left:

-y-9+3y-(-1)=0

We add all the numbers together, and all the variables

2y-8=0

We move all terms containing y to the left, all other terms to the right

2y=8

y=8/2

y=4

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