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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^2)-16 = 0
3*x^-2 = 16 // : 3
x^-2 = 16/3
-2 < 0
1/(x^2) = 16/3 // * x^2
1 = 16/3*x^2 // : 16/3
3/16 = x^2
x^2 = 3/16 // ^ 1/2
abs(x) = (3/16)^(1/2)
x = (3/16)^(1/2) or x = -(3/16)^(1/2)
x in { (3/16)^(1/2), -(3/16)^(1/2) }
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