2f+5-4f=21

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Solution for 2f+5-4f=21 equation: 



2f+5-4f=21

We move all terms to the left:

2f+5-4f-(21)=0

We add all the numbers together, and all the variables

-2f-16=0

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

-2f=16

f=16/-2

f=-8

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