-10k-13=21k+9

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Solution for -10k-13=21k+9 equation: 



-10k-13=21k+9

We move all terms to the left:

-10k-13-(21k+9)=0

We get rid of parentheses

-10k-21k-9-13=0

We add all the numbers together, and all the variables

-31k-22=0

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

-31k=22

k=22/-31

k=-22/31

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