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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
42.9/253.1 = 6.2/x // - 6.2/x
42.9/253.1-(6.2/x) = 0
42.9/253.1-6.2*x^-1 = 0
-6.2*x^-1 = -0.16949822 // : -6.2
x^-1 = 0.02733842
-1 < 0
1/(x^1) = 0.02733842 // * x^1
1 = 0.02733842*x^1 // : 0.02733842
36.57855867 = x^1
x = 36.57855867
x = 36.57855867
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