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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.05/x = 2 // - 2
0.05/x-2 = 0
0.05*x^-1 = 2 // : 0.05
x^-1 = 40
-1 < 0
1/(x^1) = 40 // * x^1
1 = 40*x^1 // : 40
1/40 = x^1
x = 1/40
x = 1/40
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