9k-7=21-k

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Solution for 9k-7=21-k equation: 



9k-7=21-k

We move all terms to the left:

9k-7-(21-k)=0

We add all the numbers together, and all the variables

9k-(-1k+21)-7=0

We get rid of parentheses

9k+1k-21-7=0

We add all the numbers together, and all the variables

10k-28=0

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

10k=28

k=28/10

k=2+4/5

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