-7f-9=-4f

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Solution for -7f-9=-4f equation: 



-7f-9=-4f

We move all terms to the left:

-7f-9-(-4f)=0

We get rid of parentheses

-7f+4f-9=0

We add all the numbers together, and all the variables

-3f-9=0

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

-3f=9

f=9/-3

f=-3

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