21=3k-2/5

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Solution for 21=3k-2/5 equation: 



21=3k-2/5

We move all terms to the left:

21-(3k-2/5)=0

We add all the numbers together, and all the variables

-(+3k-2/5)+21=0

We get rid of parentheses

-3k+21+2/5=0

We multiply all the terms by the denominator


-3k*5+2+21*5=0

We add all the numbers together, and all the variables

-3k*5+107=0

Wy multiply elements

-15k+107=0

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

-15k=-107

k=-107/-15

k=7+2/15

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