-81=10k+9

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Solution for -81=10k+9 equation: 



-81=10k+9

We move all terms to the left:

-81-(10k+9)=0

We get rid of parentheses

-10k-9-81=0

We add all the numbers together, and all the variables

-10k-90=0

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

-10k=90

k=90/-10

k=-9

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