-9=k+9

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Solution for -9=k+9 equation: 



-9=k+9

We move all terms to the left:

-9-(k+9)=0

We get rid of parentheses

-k-9-9=0

We add all the numbers together, and all the variables

-1k-18=0

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

-k=18

k=18/-1

k=-18

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