K(-9)=k(-9)=9-2k(-9)

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Solution for K(-9)=k(-9)=9-2k(-9) equation: 



(-9)=K(-9)=9-2K(-9)

We move all terms to the left:

(-9)-(K(-9))=0

We add all the numbers together, and all the variables

-(K(-9))-9=0



We calculate terms in parentheses: -(K(-9)), so:

K(-9)

We multiply parentheses

-9K

Back to the equation:

-(-9K)



We get rid of parentheses

9K-9=0

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

9K=9

K=9/9

K=1

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