2k-9=-21

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Solution for 2k-9=-21 equation: 



2k-9=-21

We move all terms to the left:

2k-9-(-21)=0

We add all the numbers together, and all the variables

2k+12=0

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

2k=-12

k=-12/2

k=-6

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