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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
42/b = 7 // - 7
42/b-7 = 0
42*b^-1 = 7 // : 42
b^-1 = 1/6
-1 < 0
1/(b^1) = 1/6 // * b^1
1 = 1/6*b^1 // : 1/6
6 = b^1
b = 6
b = 6
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