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