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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 0.52 // - 0.52
5/x-0.52 = 0
5*x^-1 = 0.52 // : 5
x^-1 = 0.104
-1 < 0
1/(x^1) = 0.104 // * x^1
1 = 0.104*x^1 // : 0.104
9.61538462 = x^1
x = 9.61538462
x = 9.61538462
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