21=31-5f

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Solution for 21=31-5f equation: 



21=31-5f

We move all terms to the left:

21-(31-5f)=0

We add all the numbers together, and all the variables

-(-5f+31)+21=0

We get rid of parentheses

5f-31+21=0

We add all the numbers together, and all the variables

5f-10=0

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

5f=10

f=10/5

f=2

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