-3f-9=7+f

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



-3f-9=7+f

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-3f-f-7-9=0

We add all the numbers together, and all the variables

-4f-16=0

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

-4f=16

f=16/-4

f=-4

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