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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)
0.003/(x^2) = 0.22*x // - 0.22*x
0.003/(x^2)-(0.22*x) = 0
0.003/(x^2)-0.22*x = 0
0.003*x^-2-0.22*x = 0
x*(0.003*x^-3-0.22) = 0
0.003*x^-3 = 0.22 // : 0.003
x^-3 = 73.33333333
-3 < 0
1/(x^3) = 73.33333333 // * x^3
1 = 73.33333333*x^3 // : 73.33333333
0.01363636 = x^3
x^3 = 0.01363636 // ^ 1/3
x = 0.01363636^(1/3)
x = 0
x = 0
x in { 0}
x = 0.01363636^(1/3)
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