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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
10/r = 5/3 // - 5/3
10/r-(5/3) = 0
10/r-5/3 = 0
10*r^-1 = 5/3 // : 10
r^-1 = 1/6
-1 < 0
1/(r^1) = 1/6 // * r^1
1 = 1/6*r^1 // : 1/6
6 = r^1
r = 6
r = 6
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