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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
a/x = b/x-b // - b/x-b
a/x-(b/x)+b = 0
a*x^-1-(b*x^-1)+b = 0
t_1 = x^-1
b+a*t_1^1-b*t_1^1 = 0
b-b*t_1 = 0 // - b
-b*t_1 = -b // : -b
t_1 = -b/(-b)
t_1 = 1
t_1 = 1
x^-1-1 = 0
1*x^-1 = 1 // : 1
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x = 1
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