21=5+3k+5k

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Solution for 21=5+3k+5k equation: 



21=5+3k+5k

We move all terms to the left:

21-(5+3k+5k)=0

We add all the numbers together, and all the variables

-(8k+5)+21=0

We get rid of parentheses

-8k-5+21=0

We add all the numbers together, and all the variables

-8k+16=0

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

-8k=-16

k=-16/-8

k=+2

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