180=-10(-9+k)

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Solution for 180=-10(-9+k) equation: 



180=-10(-9+k)

We move all terms to the left:

180-(-10(-9+k))=0

We add all the numbers together, and all the variables

-(-10(k-9))+180=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+180=0

We add all the numbers together, and all the variables

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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