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