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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.3 = 11.35/x // - 11.35/x
5.3-(11.35/x) = 0
5.3-11.35*x^-1 = 0
-11.35*x^-1 = -5.3 // : -11.35
x^-1 = 0.46696035
-1 < 0
1/(x^1) = 0.46696035 // * x^1
1 = 0.46696035*x^1 // : 0.46696035
2.14150945 = x^1
x = 2.14150945
x = 2.14150945
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