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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
10/r = -9/6 // + -9/6
10/r-(-9/6) = 0
10/r+3/2 = 0
10*r^-1 = -3/2 // : 10
r^-1 = -3/20
-1 < 0
1/(r^1) = -3/20 // * r^1
1 = -3/20*r^1 // : -3/20
-20/3 = r^1
r = -20/3
r = -20/3
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