-k-9=k+9

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Solution for -k-9=k+9 equation: 



-k-9=k+9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1k-(k+9)-9=0

We get rid of parentheses

-1k-k-9-9=0

We add all the numbers together, and all the variables

-2k-18=0

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

-2k=18

k=18/-2

k=-9

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