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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.92 = 2/x // - 2/x
3.92-(2/x) = 0
3.92-2*x^-1 = 0
-2*x^-1 = -3.92 // : -2
x^-1 = 1.96
-1 < 0
1/(x^1) = 1.96 // * x^1
1 = 1.96*x^1 // : 1.96
0.51020408 = x^1
x = 0.51020408
x = 0.51020408
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