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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
12/b-3 = 6/b+4 // - 6/b+4
12/b-(6/b)-4-3 = 0
12/b-6*b^-1-4-3 = 0
6*b^-1 = 7 // : 6
b^-1 = 7/6
-1 < 0
1/(b^1) = 7/6 // * b^1
1 = 7/6*b^1 // : 7/6
6/7 = b^1
b = 6/7
b = 6/7
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