-9-9f=7-7f

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



-9-9f=7-7f

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-9f+7f-7-9=0

We add all the numbers together, and all the variables

-2f-16=0

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

-2f=16

f=16/-2

f=-8

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