5k-21=8k

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Solution for 5k-21=8k equation: 



5k-21=8k

We move all terms to the left:

5k-21-(8k)=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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