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 get rid of parentheses

-k-7+21=0

We add all the numbers together, and all the variables

-1k+14=0

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

-k=-14

k=-14/-1

k=+14

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