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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)
0.03-(300/(x^2)) = 0
0.03-300*x^-2 = 0
-300*x^-2 = -0.03 // : -300
x^-2 = 0.0001
-2 < 0
1/(x^2) = 0.0001 // * x^2
1 = 0.0001*x^2 // : 0.0001
10000 = x^2
x^2 = 10000 // ^ 1/2
abs(x) = 100
x = 100 or x = -100
x in { 100, -100 }
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