81/3=13/r

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Solution for 81/3=13/r equation: 


D( r )

r = 0

r = 0

r = 0

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

81/3 = 13/r // - 13/r

81/3-(13/r) = 0

81/3-13*r^-1 = 0

-13*r^-1 = -27 // : -13

r^-1 = 27/13

-1 < 0

1/(r^1) = 27/13 // * r^1

1 = 27/13*r^1 // : 27/13

13/27 = r^1

r = 13/27

r = 13/27

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