-15-k=-21

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Solution for -15-k=-21 equation: 



-15-k=-21

We move all terms to the left:

-15-k-(-21)=0

We add all the numbers together, and all the variables

-1k+6=0

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

-k=-6

k=-6/-1

k=+6

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