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D( B )
B = 0
B = 0
B = 0
B in (-oo:0) U (0:+oo)
8/B = 4/13 // - 4/13
8/B-(4/13) = 0
8/B-4/13 = 0
8*B^-1 = 4/13 // : 8
B^-1 = 1/26
-1 < 0
1/(B^1) = 1/26 // * B^1
1 = 1/26*B^1 // : 1/26
26 = B^1
B = 26
B = 26
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