5f+6=21

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Solution for 5f+6=21 equation: 



5f+6=21

We move all terms to the left:

5f+6-(21)=0

We add all the numbers together, and all the variables

5f-15=0

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

5f=15

f=15/5

f=3

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