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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
8/5 = 60/b // - 60/b
8/5-(60/b) = 0
8/5-60*b^-1 = 0
-60*b^-1 = -8/5 // : -60
b^-1 = 2/75
-1 < 0
1/(b^1) = 2/75 // * b^1
1 = 2/75*b^1 // : 2/75
75/2 = b^1
b = 75/2
b = 75/2
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