-3(k+7)=9

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Solution for -3(k+7)=9 equation: 



-3(k+7)=9

We move all terms to the left:

-3(k+7)-(9)=0

We multiply parentheses

-3k-21-9=0

We add all the numbers together, and all the variables

-3k-30=0

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

-3k=30

k=30/-3

k=-10

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