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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
2/r-5/3-1 = 1/6 // - 1/6
2/r-5/3-(1/6)-1 = 0
2/r-5/3-1/6-1 = 0
2*r^-1 = 17/6 // : 2
r^-1 = 17/12
-1 < 0
1/(r^1) = 17/12 // * r^1
1 = 17/12*r^1 // : 17/12
12/17 = r^1
r = 12/17
r = 12/17
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