9=k-7-5K

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Solution for 9=k-7-5K equation: 



9=k-7-5

We move all terms to the left:

9-(k-7-5)=0

We add all the numbers together, and all the variables

-(k-12)+9=0

We get rid of parentheses

-k+12+9=0

We add all the numbers together, and all the variables

-1k+21=0

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

-k=-21

k=-21/-1

k=+21

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