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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/b-5 = -4 // + 4
3/b-5+4 = 0
3*b^-1 = 1 // : 3
b^-1 = 1/3
-1 < 0
1/(b^1) = 1/3 // * b^1
1 = 1/3*b^1 // : 1/3
3 = b^1
b = 3
b = 3
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