21-k+7=21

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Solution for 21-k+7=21 equation: 



21-k+7=21

We move all terms to the left:

21-k+7-(21)=0

We add all the numbers together, and all the variables

-1k+7=0

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

-k=-7

k=-7/-1

k=+7

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