13/29=91/r

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Solution for 13/29=91/r equation: 


D( r )

r = 0

r = 0

r = 0

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

13/29 = 91/r // - 91/r

13/29-(91/r) = 0

13/29-91*r^-1 = 0

-91*r^-1 = -13/29 // : -91

r^-1 = 1/203

-1 < 0

1/(r^1) = 1/203 // * r^1

1 = 1/203*r^1 // : 1/203

203 = r^1

r = 203

r = 203

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