13/26=39/r

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Solution for 13/26=39/r equation: 


D( r )

r = 0

r = 0

r = 0

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

13/26 = 39/r // - 39/r

13/26-(39/r) = 0

13/26-39*r^-1 = 0

-39*r^-1 = -1/2 // : -39

r^-1 = 1/78

-1 < 0

1/(r^1) = 1/78 // * r^1

1 = 1/78*r^1 // : 1/78

78 = r^1

r = 78

r = 78

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