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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
13/r = 24 // - 24
13/r-24 = 0
13*r^-1 = 24 // : 13
r^-1 = 24/13
-1 < 0
1/(r^1) = 24/13 // * r^1
1 = 24/13*r^1 // : 24/13
13/24 = r^1
r = 13/24
r = 13/24
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