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D( B )
B = 0
B = 0
B = 0
B in (-oo:0) U (0:+oo)
526/B = 39/9 // - 39/9
526/B-(39/9) = 0
526/B-13/3 = 0
526*B^-1 = 13/3 // : 526
B^-1 = 13/1578
-1 < 0
1/(B^1) = 13/1578 // * B^1
1 = 13/1578*B^1 // : 13/1578
1578/13 = B^1
B = 1578/13
B = 1578/13
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