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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 2.27 // - 2.27
10/x-2.27 = 0
10*x^-1 = 2.27 // : 10
x^-1 = 0.227
-1 < 0
1/(x^1) = 0.227 // * x^1
1 = 0.227*x^1 // : 0.227
4.40528634 = x^1
x = 4.40528634
x = 4.40528634
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