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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-((4/3)*x) = 2/9 // - 2/9
2/x-((4/3)*x)-(2/9) = 0
(-4/3)*x+2/x-2/9 = 0
2*x^-1-4/3*x^1-2/9*x^0 = 0
(2*x^0-4/3*x^2-2/9*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-4/3*x^2-2/9*x^1) = 0
x^1
(-4/3)*x^2+(-2/9)*x+2 = 0
(-4/3)*x^2+(-2/9)*x+2 = 0
DELTA = (-2/9)^2-(2*4*(-4/3))
DELTA = 868/81
DELTA > 0
x = ((868/81)^(1/2)-(-2/9))/(2*(-4/3)) or x = (-(-2/9)-(868/81)^(1/2))/(2*(-4/3))
x = -3/8*((868/81)^(1/2)+2/9) or x = -3/8*(2/9-(868/81)^(1/2))
x in { -3/8*((868/81)^(1/2)+2/9), -3/8*(2/9-(868/81)^(1/2))}
x in { -3/8*((868/81)^(1/2)+2/9), -3/8*(2/9-(868/81)^(1/2)) }
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