f-9=-8f

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Solution for f-9=-8f equation: 



f-9=-8f

We move all terms to the left:

f-9-(-8f)=0

We get rid of parentheses

f+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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