-9f-2+8=21

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Solution for -9f-2+8=21 equation: 



-9f-2+8=21

We move all terms to the left:

-9f-2+8-(21)=0

We add all the numbers together, and all the variables

-9f-15=0

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

-9f=15

f=15/-9

f=-1+2/3

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