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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
2.5/35 = 2/b // - 2/b
2.5/35-(2/b) = 0
2.5/35-2*b^-1 = 0
-2*b^-1 = -0.07142857 // : -2
b^-1 = 0.03571429
-1 < 0
1/(b^1) = 0.03571429 // * b^1
1 = 0.03571429*b^1 // : 0.03571429
27.99999664 = b^1
b = 27.99999664
b = 27.99999664
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