20=(200)(r)(0.5)

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Solution for 20=(200)(r)(0.5) equation: 



20=(200)(r)(0.5)

We move all terms to the left:

20-((200)(r)(0.5))=0



We calculate terms in parentheses: -(200r(0.5)), so:

200r(0.5)

We multiply parentheses

100r

Back to the equation:

-(100r)



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

-100r=-20

r=-20/-100

r=1/5

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