9k=10(k-9)

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Solution for 9k=10(k-9) equation: 



9k=10(k-9)

We move all terms to the left:

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



We calculate terms in parentheses: -(10(k-9)), so:

10(k-9)

We multiply parentheses

10k-90

Back to the equation:

-(10k-90)



We get rid of parentheses

9k-10k+90=0

We add all the numbers together, and all the variables

-1k+90=0

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

-k=-90

k=-90/-1

k=+90

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