50=-10(k-9)

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Solution for 50=-10(k-9) equation: 



50=-10(k-9)

We move all terms to the left:

50-(-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+50=0

We add all the numbers together, and all the variables

10k-40=0

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

10k=40

k=40/10

k=4

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