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 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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