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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)
(0.055-(4*x))/(x^2) = 0
(0.055-4*x)/(x^2) = 0
0.055-4*x = 0 // - 0.055
-4*x = -0.055 // : -4
x = -0.055/(-4)
x = 0.01375
x = 0.01375
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