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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
56/84 = 16/b // - 16/b
56/84-(16/b) = 0
56/84-16*b^-1 = 0
-16*b^-1 = -2/3 // : -16
b^-1 = 1/24
-1 < 0
1/(b^1) = 1/24 // * b^1
1 = 1/24*b^1 // : 1/24
24 = b^1
b = 24
b = 24
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