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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
1/b = 1/22-(1/40) // - 1/22-(1/40)
1/b-(1/22)+1/40 = 0
1/b-1/22+1/40 = 0
1*b^-1 = 9/440 // : 1
b^-1 = 9/440
-1 < 0
1/(b^1) = 9/440 // * b^1
1 = 9/440*b^1 // : 9/440
440/9 = b^1
b = 440/9
b = 440/9
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