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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
10/r = 1 // - 1
10/r-1 = 0
10*r^-1 = 1 // : 10
r^-1 = 1/10
-1 < 0
1/(r^1) = 1/10 // * r^1
1 = 1/10*r^1 // : 1/10
10 = r^1
r = 10
r = 10
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