21=f+2/5

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Solution for 21=f+2/5 equation: 



21=f+2/5

We move all terms to the left:

21-(f+2/5)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-f+21-2/5=0

We multiply all the terms by the denominator


-f*5-2+21*5=0

We add all the numbers together, and all the variables

-f*5+103=0

Wy multiply elements

-5f+103=0

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

-5f=-103

f=-103/-5

f=20+3/5

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