21=-3k-3

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Solution for 21=-3k-3 equation: 



21=-3k-3

We move all terms to the left:

21-(-3k-3)=0

We get rid of parentheses

3k+3+21=0

We add all the numbers together, and all the variables

3k+24=0

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

3k=-24

k=-24/3

k=-8

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