-9+3f=7f+3

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Solution for -9+3f=7f+3 equation: 



-9+3f=7f+3

We move all terms to the left:

-9+3f-(7f+3)=0

We get rid of parentheses

3f-7f-3-9=0

We add all the numbers together, and all the variables

-4f-12=0

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

-4f=12

f=12/-4

f=-3

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