-9=-7+y

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Solution for -9=-7+y equation: 



-9=-7+y

We move all terms to the left:

-9-(-7+y)=0

We add all the numbers together, and all the variables

-(y-7)-9=0

We get rid of parentheses

-y+7-9=0

We add all the numbers together, and all the variables

-1y-2=0

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

-y=2

y=2/-1

y=-2

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