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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
29.5/r-101.7 = 0
29.5*r^-1 = 101.7 // : 29.5
r^-1 = 3.44745763
-1 < 0
1/(r^1) = 3.44745763 // * r^1
1 = 3.44745763*r^1 // : 3.44745763
0.29006883 = r^1
r = 0.29006883
r = 0.29006883
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