9-6f=f-12

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Solution for 9-6f=f-12 equation: 



9-6f=f-12

We move all terms to the left:

9-6f-(f-12)=0

We get rid of parentheses

-6f-f+12+9=0

We add all the numbers together, and all the variables

-7f+21=0

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

-7f=-21

f=-21/-7

f=+3

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