99=3(k+21)

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Solution for 99=3(k+21) equation: 



99=3(k+21)

We move all terms to the left:

99-(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+99=0

We add all the numbers together, and all the variables

-3k+36=0

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

-3k=-36

k=-36/-3

k=+12

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