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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
9/20 = 24/b // - 24/b
9/20-(24/b) = 0
9/20-24*b^-1 = 0
-24*b^-1 = -9/20 // : -24
b^-1 = 3/160
-1 < 0
1/(b^1) = 3/160 // * b^1
1 = 3/160*b^1 // : 3/160
160/3 = b^1
b = 160/3
b = 160/3
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