-7k+21=-7(2+6k)

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Solution for -7k+21=-7(2+6k) equation: 



-7k+21=-7(2+6k)

We move all terms to the left:

-7k+21-(-7(2+6k))=0

We add all the numbers together, and all the variables

-7k-(-7(6k+2))+21=0



We calculate terms in parentheses: -(-7(6k+2)), so:

-7(6k+2)

We multiply parentheses

-42k-14

Back to the equation:

-(-42k-14)



We get rid of parentheses

-7k+42k+14+21=0

We add all the numbers together, and all the variables

35k+35=0

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

35k=-35

k=-35/35

k=-1

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