-21-3k=-4(k+7)

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Solution for -21-3k=-4(k+7) equation: 



-21-3k=-4(k+7)

We move all terms to the left:

-21-3k-(-4(k+7))=0



We calculate terms in parentheses: -(-4(k+7)), so:

-4(k+7)

We multiply parentheses

-4k-28

Back to the equation:

-(-4k-28)



We get rid of parentheses

-3k+4k+28-21=0

We add all the numbers together, and all the variables

k+7=0

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

k=-7

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