-f=8f+9

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Solution for -f=8f+9 equation: 



-f=8f+9

We move all terms to the left:

-f-(8f+9)=0

We add all the numbers together, and all the variables

-1f-(8f+9)=0

We get rid of parentheses

-1f-8f-9=0

We add all the numbers together, and all the variables

-9f-9=0

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

-9f=9

f=9/-9

f=-1

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