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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(4/(x^2)) = (3/2)*x // - (3/2)*x
3*x-((3/2)*x)-(4/(x^2)) = 0
3*x+(-3/2)*x-4*x^-2 = 0
3/2*x-4*x^-2 = 0
x*(3/2-4*x^-3) = 0
-4*x^-3 = -3/2 // : -4
x^-3 = 3/8
-3 < 0
1/(x^3) = 3/8 // * x^3
1 = 3/8*x^3 // : 3/8
8/3 = x^3
x^3 = 8/3 // ^ 1/3
x = (8/3)^(1/3)
x = 0
x = 0
x in { 0}
x = (8/3)^(1/3)
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