30=10(k+9)

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Solution for 30=10(k+9) equation: 



30=10(k+9)

We move all terms to the left:

30-(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

-10k-90+30=0

We add all the numbers together, and all the variables

-10k-60=0

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

-10k=60

k=60/-10

k=-6

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