21=-5k-2k

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Solution for 21=-5k-2k equation: 



21=-5k-2k

We move all terms to the left:

21-(-5k-2k)=0

We add all the numbers together, and all the variables

-(-7k)+21=0

We get rid of parentheses

7k+21=0

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

7k=-21

k=-21/7

k=-3

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