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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-2 = (5/9)*x // - (5/9)*x
3/x-((5/9)*x)-2 = 0
(-5/9)*x+3/x-2 = 0
3*x^-1-5/9*x^1-2*x^0 = 0
(3*x^0-5/9*x^2-2*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-5/9*x^2-2*x^1) = 0
x^1
(-5/9)*x^2-2*x+3 = 0
(-5/9)*x^2-2*x+3 = 0
DELTA = (-2)^2-(3*4*(-5/9))
DELTA = 32/3
DELTA > 0
x = ((32/3)^(1/2)+2)/(2*(-5/9)) or x = (2-(32/3)^(1/2))/(2*(-5/9))
x = -9/10*((32/3)^(1/2)+2) or x = -9/10*(2-(32/3)^(1/2))
x in { -9/10*((32/3)^(1/2)+2), -9/10*(2-(32/3)^(1/2))}
x in { -9/10*((32/3)^(1/2)+2), -9/10*(2-(32/3)^(1/2)) }
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