K-1+3k=-21

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Solution for K-1+3k=-21 equation: 



-1+3K=-21

We move all terms to the left:

-1+3K-(-21)=0

We add all the numbers together, and all the variables

3K+20=0

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

3K=-20

K=-20/3

K=-6+2/3

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