27/81=3/r

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Solution for 27/81=3/r equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

27/81 = 3/r // - 3/r

27/81-(3/r) = 0

27/81-3*r^-1 = 0

-3*r^-1 = -1/3 // : -3

r^-1 = 1/9

-1 < 0

1/(r^1) = 1/9 // * r^1

1 = 1/9*r^1 // : 1/9

9 = r^1

r = 9

r = 9

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