39=9f-21

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Solution for 39=9f-21 equation: 



39=9f-21

We move all terms to the left:

39-(9f-21)=0

We get rid of parentheses

-9f+21+39=0

We add all the numbers together, and all the variables

-9f+60=0

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

-9f=-60

f=-60/-9

f=6+2/3

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