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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8/3 = 5/b // - 5/b
8/3-(5/b) = 0
8/3-5*b^-1 = 0
-5*b^-1 = -8/3 // : -5
b^-1 = 8/15
-1 < 0
1/(b^1) = 8/15 // * b^1
1 = 8/15*b^1 // : 8/15
15/8 = b^1
b = 15/8
b = 15/8
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