-6f-12=f+9

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



-6f-12=f+9

We move all terms to the left:

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

We get rid of parentheses

-6f-f-9-12=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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