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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
5/r = 12/5 // - 12/5
5/r-(12/5) = 0
5/r-12/5 = 0
5*r^-1 = 12/5 // : 5
r^-1 = 12/25
-1 < 0
1/(r^1) = 12/25 // * r^1
1 = 12/25*r^1 // : 12/25
25/12 = r^1
r = 25/12
r = 25/12
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