21=1+2k+8k

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Solution for 21=1+2k+8k equation: 



21=1+2k+8k

We move all terms to the left:

21-(1+2k+8k)=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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