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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
62/b = 40/100 // - 40/100
62/b-(40/100) = 0
62/b-2/5 = 0
62*b^-1 = 2/5 // : 62
b^-1 = 1/155
-1 < 0
1/(b^1) = 1/155 // * b^1
1 = 1/155*b^1 // : 1/155
155 = b^1
b = 155
b = 155
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