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