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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/35.46 = 6/x // - 6/x
3/35.46-(6/x) = 0
3/35.46-6*x^-1 = 0
-6*x^-1 = -0.08460237 // : -6
x^-1 = 0.0141004
-1 < 0
1/(x^1) = 0.0141004 // * x^1
1 = 0.0141004*x^1 // : 0.0141004
70.9199739 = x^1
x = 70.9199739
x = 70.9199739
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