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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.1/5.3 = 4.3/x // - 4.3/x
4.1/5.3-(4.3/x) = 0
4.1/5.3-4.3*x^-1 = 0
-4.3*x^-1 = -0.77358491 // : -4.3
x^-1 = 0.17990347
-1 < 0
1/(x^1) = 0.17990347 // * x^1
1 = 0.17990347*x^1 // : 0.17990347
5.55853648 = x^1
x = 5.55853648
x = 5.55853648
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