3/4/r=1/20

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Solution for 3/4/r=1/20 equation: 


D( r )

r = 0

r = 0

r = 0

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

(3/4)/r = 1/20 // - 1/20

(3/4)/r-(1/20) = 0

(3/4)/r-1/20 = 0

3/4*r^-1 = 1/20 // : 3/4

r^-1 = 1/15

-1 < 0

1/(r^1) = 1/15 // * r^1

1 = 1/15*r^1 // : 1/15

15 = r^1

r = 15

r = 15

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