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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/5)*x-(4/x) = -3 // + 3
(6/5)*x-(4/x)+3 = 0
(6/5)*x-4*x^-1+3 = 0
6/5*x^1-4*x^-1+3*x^0 = 0
(6/5*x^2+3*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(6/5*x^2+3*x^1-4*x^0) = 0
x^1
(6/5)*x^2+3*x-4 = 0
(6/5)*x^2+3*x-4 = 0
DELTA = 3^2-(-4*4*(6/5))
DELTA = 141/5
DELTA > 0
x = ((141/5)^(1/2)-3)/(2*(6/5)) or x = (-(141/5)^(1/2)-3)/(2*(6/5))
x = 5/12*((141/5)^(1/2)-3) or x = -5/12*((141/5)^(1/2)+3)
x in { -5/12*((141/5)^(1/2)+3), 5/12*((141/5)^(1/2)-3)}
x in { -5/12*((141/5)^(1/2)+3), 5/12*((141/5)^(1/2)-3) }
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