8f-4-9=-21

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Solution for 8f-4-9=-21 equation: 



8f-4-9=-21

We move all terms to the left:

8f-4-9-(-21)=0

We add all the numbers together, and all the variables

8f+8=0

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

8f=-8

f=-8/8

f=-1

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