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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
72/b = 6 // - 6
72/b-6 = 0
72*b^-1 = 6 // : 72
b^-1 = 1/12
-1 < 0
1/(b^1) = 1/12 // * b^1
1 = 1/12*b^1 // : 1/12
12 = b^1
b = 12
b = 12
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