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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.33/x-10 = 0
0.33*x^-1 = 10 // : 0.33
x^-1 = 30.3030303
-1 < 0
1/(x^1) = 30.3030303 // * x^1
1 = 30.3030303*x^1 // : 30.3030303
0.033 = x^1
x = 0.033
x = 0.033
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