21-7k=-9(k+1)-6

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Solution for 21-7k=-9(k+1)-6 equation: 



21-7k=-9(k+1)-6

We move all terms to the left:

21-7k-(-9(k+1)-6)=0



We calculate terms in parentheses: -(-9(k+1)-6), so:

-9(k+1)-6

We multiply parentheses

-9k-9-6

We add all the numbers together, and all the variables

-9k-15

Back to the equation:

-(-9k-15)



We get rid of parentheses

-7k+9k+15+21=0

We add all the numbers together, and all the variables

2k+36=0

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

2k=-36

k=-36/2

k=-18

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