-21=7k-1+3k

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Solution for -21=7k-1+3k equation: 



-21=7k-1+3k

We move all terms to the left:

-21-(7k-1+3k)=0

We add all the numbers together, and all the variables

-(10k-1)-21=0

We get rid of parentheses

-10k+1-21=0

We add all the numbers together, and all the variables

-10k-20=0

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

-10k=20

k=20/-10

k=-2

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