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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(2/3) = (7/5)*x // - (7/5)*x
3/x-((7/5)*x)-(2/3) = 0
(-7/5)*x+3/x-2/3 = 0
3*x^-1-7/5*x^1-2/3*x^0 = 0
(3*x^0-7/5*x^2-2/3*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-7/5*x^2-2/3*x^1) = 0
x^1
(-7/5)*x^2+(-2/3)*x+3 = 0
(-7/5)*x^2+(-2/3)*x+3 = 0
DELTA = (-2/3)^2-(3*4*(-7/5))
DELTA = 776/45
DELTA > 0
x = ((776/45)^(1/2)-(-2/3))/(2*(-7/5)) or x = (-(-2/3)-(776/45)^(1/2))/(2*(-7/5))
x = -5/14*((776/45)^(1/2)+2/3) or x = -5/14*(2/3-(776/45)^(1/2))
x in { -5/14*((776/45)^(1/2)+2/3), -5/14*(2/3-(776/45)^(1/2))}
x in { -5/14*((776/45)^(1/2)+2/3), -5/14*(2/3-(776/45)^(1/2)) }
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