k=-9;k=16;k=21

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Solution for k=-9;k=16;k=21 equation: 



k=-9k=16k=21

We move all terms to the left:

k-(-9k)=0

We get rid of parentheses

k+9k=0

We add all the numbers together, and all the variables

10k=0

k=0/10

k=0

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