21=42-7k

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Solution for 21=42-7k equation: 



21=42-7k

We move all terms to the left:

21-(42-7k)=0

We add all the numbers together, and all the variables

-(-7k+42)+21=0

We get rid of parentheses

7k-42+21=0

We add all the numbers together, and all the variables

7k-21=0

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

7k=21

k=21/7

k=3

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