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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
13.8-(1.4/b) = 13.6 // - 13.6
13.8-(1.4/b)-13.6 = 0
13.8-1.4*b^-1-13.6 = 0
-1.4*b^-1 = -0.2 // : -1.4
b^-1 = 0.14285714
-1 < 0
1/(b^1) = 0.14285714 // * b^1
1 = 0.14285714*b^1 // : 0.14285714
7.00000014 = b^1
b = 7.00000014
b = 7.00000014
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