81=-9(k+3)

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Solution for 81=-9(k+3) equation: 



81=-9(k+3)

We move all terms to the left:

81-(-9(k+3))=0



We calculate terms in parentheses: -(-9(k+3)), so:

-9(k+3)

We multiply parentheses

-9k-27

Back to the equation:

-(-9k-27)



We get rid of parentheses

9k+27+81=0

We add all the numbers together, and all the variables

9k+108=0

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

9k=-108

k=-108/9

k=-12

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