-21=-10k+3k

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Solution for -21=-10k+3k equation: 



-21=-10k+3k

We move all terms to the left:

-21-(-10k+3k)=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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