-2f-9=-f

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Solution for -2f-9=-f equation: 



-2f-9=-f

We move all terms to the left:

-2f-9-(-f)=0

We add all the numbers together, and all the variables

-2f-(-1f)-9=0

We get rid of parentheses

-2f+1f-9=0

We add all the numbers together, and all the variables

-1f-9=0

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

-f=9

f=9/-1

f=-9

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