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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
36/43 = 24/r // - 24/r
36/43-(24/r) = 0
36/43-24*r^-1 = 0
-24*r^-1 = -36/43 // : -24
r^-1 = 3/86
-1 < 0
1/(r^1) = 3/86 // * r^1
1 = 3/86*r^1 // : 3/86
86/3 = r^1
r = 86/3
r = 86/3
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