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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
17/2 = 7/r // - 7/r
17/2-(7/r) = 0
17/2-7*r^-1 = 0
-7*r^-1 = -17/2 // : -7
r^-1 = 17/14
-1 < 0
1/(r^1) = 17/14 // * r^1
1 = 17/14*r^1 // : 17/14
14/17 = r^1
r = 14/17
r = 14/17
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