-21=4f+6f

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Solution for -21=4f+6f equation: 



-21=4f+6f

We move all terms to the left:

-21-(4f+6f)=0

We add all the numbers together, and all the variables

-(+10f)-21=0

We get rid of parentheses

-10f-21=0

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

-10f=21

f=21/-10

f=-2+1/10

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