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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3-(1/x) = (7/5)*x-(9/5) // - (7/5)*x-(9/5)
9/5-((7/5)*x)-(1/x)+3 = 0
(-7/5)*x-x^-1+9/5+3 = 0
24/5*x^0-7/5*x^1-1*x^-1 = 0
(24/5*x^1-7/5*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(24/5*x^1-7/5*x^2-1*x^0) = 0
x^1
(-7/5)*x^2+(24/5)*x-1 = 0
(-7/5)*x^2+(24/5)*x-1 = 0
DELTA = (24/5)^2-(-1*4*(-7/5))
DELTA = 436/25
DELTA > 0
x = ((436/25)^(1/2)-(24/5))/(2*(-7/5)) or x = (-(24/5)-(436/25)^(1/2))/(2*(-7/5))
x = -5/14*((436/25)^(1/2)-24/5) or x = 5/14*((436/25)^(1/2)+24/5)
x in { -5/14*((436/25)^(1/2)-24/5), 5/14*((436/25)^(1/2)+24/5)}
x in { -5/14*((436/25)^(1/2)-24/5), 5/14*((436/25)^(1/2)+24/5) }
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