-9f=-7f-4

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



-9f=-7f-4

We move all terms to the left:

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

We get rid of parentheses

-9f+7f+4=0

We add all the numbers together, and all the variables

-2f+4=0

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

-2f=-4

f=-4/-2

f=+2

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