-3(7+k)=21

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



-3(7+k)=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3(k+7)-21=0

We multiply parentheses

-3k-21-21=0

We add all the numbers together, and all the variables

-3k-42=0

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

-3k=42

k=42/-3

k=-14

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