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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-a)/x = b // - b
(x-a)/x-b = 0
(x-a)/x+(-b*x)/x = 0
x-a-b*x = 0
x-a-(b*x) = 0
x-a-(b*x) = 0
-a-b*x = 0 // + a
-b*x = a // : -b
x = a/(-b)
x = -(a*b^-1)
a*b^-1+x = 0
(a*b^-1+x)/x = 0
(a*b^-1+x)/x = 0 // * x
a*b^-1+x = 0
a*b^-1+x = 0 // - a*b^-1
x = -(a*b^-1)
x = -(a*b^-1)
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