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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1 = 3/x // - 3/x
0.1-(3/x) = 0
0.1-3*x^-1 = 0
-3*x^-1 = -0.1 // : -3
x^-1 = 0.03333333
-1 < 0
1/(x^1) = 0.03333333 // * x^1
1 = 0.03333333*x^1 // : 0.03333333
30.000003 = x^1
x = 30.000003
x = 30.000003
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