r/(r-5)*10/r=1

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Solution for r/(r-5)*10/r=1 equation: 


D( r )

r = 0

r-5 = 0

r = 0

r = 0

r-5 = 0

r-5 = 0

r-5 = 0 // + 5

r = 5

r in (-oo:0) U (0:5) U (5:+oo)

(10*(r/(r-5)))/r = 1 // - 1

(10*(r/(r-5)))/r-1 = 0

10/(r-5)-1 = 0

10/(r-5)+(-1*(r-5))/(r-5) = 0

10-1*(r-5) = 0

15-r = 0

(15-r)/(r-5) = 0

(15-r)/(r-5) = 0 // * r-5

15-r = 0

15-r = 0 // - 15

-r = -15 // * -1

r = 15

r = 15

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