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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*a)/x-((4*b)/x) = 5*c // - 5*c
(3*a)/x-((4*b)/x)-(5*c) = 0
(3*a)/x-4*b*x^-1-5*c = 0
3*a*x^-1-4*b*x^-1-5*c = 0
t_1 = x^-1
3*a*t_1^1-5*c-4*b*t_1^1 = 0
-5*c-4*b*t_1 = 0 // + -5*c
-4*b*t_1 = -(-5*c) // : -4*b
t_1 = (-(-5*c))/(-4*b)
t_1 = (5*c)/(-4*b)
t_1 = (5*c)/(-4*b)
x^-1-((5*c)/(-4*b)) = 0
(5/4)*b^-1*c+x^-1 = 0
1*x^-1 = -(5/4*b^-1*c) // : 1
x^-1 = -5/4*b^-1*c
-1 < 0
1/(x^1) = -5/4*b^-1*c // * x^1
1 = -5/4*b^-1*c*x^1 // : -5/4*b^-1*c
-4/5*b*c^-1 = x^1
x = -4/5*b*c^-1
x = -4/5*b*c^-1
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