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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/x = 3.46 // - 3.46
50/x-3.46 = 0
50*x^-1 = 3.46 // : 50
x^-1 = 0.0692
-1 < 0
1/(x^1) = 0.0692 // * x^1
1 = 0.0692*x^1 // : 0.0692
14.45086705 = x^1
x = 14.45086705
x = 14.45086705
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