-3f-9=6f

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Solution for -3f-9=6f equation: 



-3f-9=6f

We move all terms to the left:

-3f-9-(6f)=0

We add all the numbers together, and all the variables

-9f-9=0

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

-9f=9

f=9/-9

f=-1

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