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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
4.2/b = 1.5/100 // - 1.5/100
4.2/b-(1.5/100) = 0
4.2/b-0.015 = 0
4.2*b^-1 = 0.015 // : 4.2
b^-1 = 0.00357143
-1 < 0
1/(b^1) = 0.00357143 // * b^1
1 = 0.00357143*b^1 // : 0.00357143
279.999888 = b^1
b = 279.999888
b = 279.999888
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