9f-30f=9

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Solution for 9f-30f=9 equation: 



9f-30f=9

We move all terms to the left:

9f-30f-(9)=0

We add all the numbers together, and all the variables

-21f-9=0

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

-21f=9

f=9/-21

f=-3/7

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