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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
10/r = 4/6 // - 4/6
10/r-(4/6) = 0
10/r-2/3 = 0
10*r^-1 = 2/3 // : 10
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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