180=r(-12)

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Solution for 180=r(-12) equation: 



180=r(-12)

We move all terms to the left:

180-(r(-12))=0



We calculate terms in parentheses: -(r(-12)), so:

r(-12)

We multiply parentheses

-12r

Back to the equation:

-(-12r)



We get rid of parentheses

12r+180=0

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

12r=-180

r=-180/12

r=-15

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