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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
24/b = 8/7 // - 8/7
24/b-(8/7) = 0
24/b-8/7 = 0
24*b^-1 = 8/7 // : 24
b^-1 = 1/21
-1 < 0
1/(b^1) = 1/21 // * b^1
1 = 1/21*b^1 // : 1/21
21 = b^1
b = 21
b = 21
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