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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/20 = 6.2/x // - 6.2/x
1/20-(6.2/x) = 0
1/20-6.2*x^-1 = 0
-6.2*x^-1 = -1/20 // : -6.2
x^-1 = 0.00806452
-1 < 0
1/(x^1) = 0.00806452 // * x^1
1 = 0.00806452*x^1 // : 0.00806452
123.99994048 = x^1
x = 123.99994048
x = 123.99994048
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