21=5-4k

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Solution for 21=5-4k equation: 



21=5-4k

We move all terms to the left:

21-(5-4k)=0

We add all the numbers together, and all the variables

-(-4k+5)+21=0

We get rid of parentheses

4k-5+21=0

We add all the numbers together, and all the variables

4k+16=0

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

4k=-16

k=-16/4

k=-4

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