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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
47.2/x = 1.1 // - 1.1
47.2/x-1.1 = 0
47.2*x^-1 = 1.1 // : 47.2
x^-1 = 0.02330508
-1 < 0
1/(x^1) = 0.02330508 // * x^1
1 = 0.02330508*x^1 // : 0.02330508
42.90909965 = x^1
x = 42.90909965
x = 42.90909965
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