2k=21-k

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Solution for 2k=21-k equation: 



2k=21-k

We move all terms to the left:

2k-(21-k)=0

We add all the numbers together, and all the variables

2k-(-1k+21)=0

We get rid of parentheses

2k+1k-21=0

We add all the numbers together, and all the variables

3k-21=0

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

3k=21

k=21/3

k=7

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