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D( B )
B = 0
B = 0
B = 0
B in (-oo:0) U (0:+oo)
17 = 2.5/B // - 2.5/B
17-(2.5/B) = 0
17-2.5*B^-1 = 0
-2.5*B^-1 = -17 // : -2.5
B^-1 = 6.8
-1 < 0
1/(B^1) = 6.8 // * B^1
1 = 6.8*B^1 // : 6.8
0.14705882 = B^1
B = 0.14705882
B = 0.14705882
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