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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8/14 = 10/b // - 10/b
8/14-(10/b) = 0
8/14-10*b^-1 = 0
-10*b^-1 = -4/7 // : -10
b^-1 = 2/35
-1 < 0
1/(b^1) = 2/35 // * b^1
1 = 2/35*b^1 // : 2/35
35/2 = b^1
b = 35/2
b = 35/2
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