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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
24/r = 8 // - 8
24/r-8 = 0
24*r^-1 = 8 // : 24
r^-1 = 1/3
-1 < 0
1/(r^1) = 1/3 // * r^1
1 = 1/3*r^1 // : 1/3
3 = r^1
r = 3
r = 3
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