21=-7k+10k

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Solution for 21=-7k+10k equation: 



21=-7k+10k

We move all terms to the left:

21-(-7k+10k)=0

We add all the numbers together, and all the variables

-(+3k)+21=0

We get rid of parentheses

-3k+21=0

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

-3k=-21

k=-21/-3

k=+7

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