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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-((5*x)/4)-1 = 0
(-5/4)*x+6/x-1 = 0
6*x^-1-5/4*x^1-1*x^0 = 0
(6*x^0-5/4*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(6*x^0-5/4*x^2-1*x^1) = 0
x^1
(-5/4)*x^2-x+6 = 0
(-5/4)*x^2-x+6 = 0
DELTA = (-1)^2-(4*6*(-5/4))
DELTA = 31
DELTA > 0
x = (31^(1/2)+1)/(2*(-5/4)) or x = (1-31^(1/2))/(2*(-5/4))
x = -2/5*(31^(1/2)+1) or x = -2/5*(1-31^(1/2))
x in { -2/5*(31^(1/2)+1), -2/5*(1-31^(1/2))}
x in { -2/5*(31^(1/2)+1), -2/5*(1-31^(1/2)) }
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