21=24+7k

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Solution for 21=24+7k equation: 



21=24+7k

We move all terms to the left:

21-(24+7k)=0

We add all the numbers together, and all the variables

-(7k+24)+21=0

We get rid of parentheses

-7k-24+21=0

We add all the numbers together, and all the variables

-7k-3=0

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

-7k=3

k=3/-7

k=-3/7

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