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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
17/r = 10 // - 10
17/r-10 = 0
17*r^-1 = 10 // : 17
r^-1 = 10/17
-1 < 0
1/(r^1) = 10/17 // * r^1
1 = 10/17*r^1 // : 10/17
17/10 = r^1
r = 17/10
r = 17/10
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