-21=2k-9k

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Solution for -21=2k-9k equation: 



-21=2k-9k

We move all terms to the left:

-21-(2k-9k)=0

We add all the numbers together, and all the variables

-(-7k)-21=0

We get rid of parentheses

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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