21=k*7

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Solution for 21=k*7 equation: 



21=k*7

We move all terms to the left:

21-(k*7)=0

We add all the numbers together, and all the variables

-(+k*7)+21=0

We get rid of parentheses

-k*7+21=0

Wy multiply elements

-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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