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D( B )
B = 0
B = 0
B = 0
B in (-oo:0) U (0:+oo)
6/B-7 = 9/7 // - 9/7
6/B-(9/7)-7 = 0
6/B-9/7-7 = 0
6*B^-1 = 58/7 // : 6
B^-1 = 29/21
-1 < 0
1/(B^1) = 29/21 // * B^1
1 = 29/21*B^1 // : 29/21
21/29 = B^1
B = 21/29
B = 21/29
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