-21=k-8

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Solution for -21=k-8 equation: 



-21=k-8

We move all terms to the left:

-21-(k-8)=0

We get rid of parentheses

-k+8-21=0

We add all the numbers together, and all the variables

-1k-13=0

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

-k=13

k=13/-1

k=-13

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