21+7k=7(-5+5k)

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Solution for 21+7k=7(-5+5k) equation: 



21+7k=7(-5+5k)

We move all terms to the left:

21+7k-(7(-5+5k))=0

We add all the numbers together, and all the variables

7k-(7(5k-5))+21=0



We calculate terms in parentheses: -(7(5k-5)), so:

7(5k-5)

We multiply parentheses

35k-35

Back to the equation:

-(35k-35)



We get rid of parentheses

7k-35k+35+21=0

We add all the numbers together, and all the variables

-28k+56=0

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

-28k=-56

k=-56/-28

k=+2

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