21=84-k

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Solution for 21=84-k equation: 



21=84-k

We move all terms to the left:

21-(84-k)=0

We add all the numbers together, and all the variables

-(-1k+84)+21=0

We get rid of parentheses

1k-84+21=0

We add all the numbers together, and all the variables

k-63=0

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

k=63

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