-k-9=-9-k

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



-k-9=-9-k

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-1k+1k+9-9=0

We add all the numbers together, and all the variables

=0

k=0/1

k=0

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