3f=9f-3=7-f

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



3f=9f-3=7-f

We move all terms to the left:

3f-(9f-3)=0

We get rid of parentheses

3f-9f+3=0

We add all the numbers together, and all the variables

-6f+3=0

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

-6f=-3

f=-3/-6

f=1/2

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