-3f-3=f+9

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



-3f-3=f+9

We move all terms to the left:

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

We get rid of parentheses

-3f-f-9-3=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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