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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
8/r+3/r-1 = 3 // - 3
8/r+3/r-3-1 = 0
11*r^-1 = 4 // : 11
r^-1 = 4/11
-1 < 0
1/(r^1) = 4/11 // * r^1
1 = 4/11*r^1 // : 4/11
11/4 = r^1
r = 11/4
r = 11/4
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