-3k+7(k+7)=8k+21

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Solution for -3k+7(k+7)=8k+21 equation: 



-3k+7(k+7)=8k+21

We move all terms to the left:

-3k+7(k+7)-(8k+21)=0

We multiply parentheses

-3k+7k-(8k+21)+49=0

We get rid of parentheses

-3k+7k-8k-21+49=0

We add all the numbers together, and all the variables

-4k+28=0

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

-4k=-28

k=-28/-4

k=+7

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