-9+7f=9+f+8f

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Solution for -9+7f=9+f+8f equation: 



-9+7f=9+f+8f

We move all terms to the left:

-9+7f-(9+f+8f)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

7f-9f-9-9=0

We add all the numbers together, and all the variables

-2f-18=0

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

-2f=18

f=18/-2

f=-9

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