-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 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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