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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 185.6/4 // - 185.6/4
2/x-(185.6/4) = 0
2/x-46.4 = 0
2*x^-1 = 46.4 // : 2
x^-1 = 23.2
-1 < 0
1/(x^1) = 23.2 // * x^1
1 = 23.2*x^1 // : 23.2
0.04310345 = x^1
x = 0.04310345
x = 0.04310345
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