-24=-3(k-21)

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Solution for -24=-3(k-21) equation: 



-24=-3(k-21)

We move all terms to the left:

-24-(-3(k-21))=0



We calculate terms in parentheses: -(-3(k-21)), so:

-3(k-21)

We multiply parentheses

-3k+63

Back to the equation:

-(-3k+63)



We get rid of parentheses

3k-63-24=0

We add all the numbers together, and all the variables

3k-87=0

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

3k=87

k=87/3

k=29

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