C(2,-8);r=9

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Solution for C(2,-8);r=9 equation: 



(2.-8)C=9

We move all terms to the left:

(2.-8)C-(9)=0

We add all the numbers together, and all the variables

(-6)C-9=0

We multiply parentheses

-6C-9=0

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

-6C=9

C=9/-6

C=-1+1/2

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