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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
5/9 = 6/r // - 6/r
5/9-(6/r) = 0
5/9-6*r^-1 = 0
-6*r^-1 = -5/9 // : -6
r^-1 = 5/54
-1 < 0
1/(r^1) = 5/54 // * r^1
1 = 5/54*r^1 // : 5/54
54/5 = r^1
r = 54/5
r = 54/5
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