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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.6/x = 15.4 // - 15.4
1.6/x-15.4 = 0
1.6*x^-1 = 15.4 // : 1.6
x^-1 = 9.625
-1 < 0
1/(x^1) = 9.625 // * x^1
1 = 9.625*x^1 // : 9.625
0.1038961 = x^1
x = 0.1038961
x = 0.1038961
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