(K-10)(k+9)=0

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Solution for (K-10)(k+9)=0 equation: 



(-10)(K+9)=0

We multiply parentheses ..

(-10K-90)=0

We get rid of parentheses

-10K-90=0

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

-10K=90

K=90/-10

K=-9

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