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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.55/x = 3/6 // - 3/6
4.55/x-(3/6) = 0
4.55/x-1/2 = 0
4.55*x^-1 = 1/2 // : 4.55
x^-1 = 0.10989011
-1 < 0
1/(x^1) = 0.10989011 // * x^1
1 = 0.10989011*x^1 // : 0.10989011
9.09999999 = x^1
x = 9.09999999
x = 9.09999999
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