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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
9/6 = 15/b // - 15/b
9/6-(15/b) = 0
9/6-15*b^-1 = 0
-15*b^-1 = -3/2 // : -15
b^-1 = 1/10
-1 < 0
1/(b^1) = 1/10 // * b^1
1 = 1/10*b^1 // : 1/10
10 = b^1
b = 10
b = 10
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