-9=-7+f

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Solution for -9=-7+f equation: 



-9=-7+f

We move all terms to the left:

-9-(-7+f)=0

We add all the numbers together, and all the variables

-(f-7)-9=0

We get rid of parentheses

-f+7-9=0

We add all the numbers together, and all the variables

-1f-2=0

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

-f=2

f=2/-1

f=-2

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