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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1 = 1.54/x // - 1.54/x
0.1-(1.54/x) = 0
0.1-1.54*x^-1 = 0
-1.54*x^-1 = -0.1 // : -1.54
x^-1 = 0.06493506
-1 < 0
1/(x^1) = 0.06493506 // * x^1
1 = 0.06493506*x^1 // : 0.06493506
15.40000117 = x^1
x = 15.40000117
x = 15.40000117
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