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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.2 = 8.2/x // - 8.2/x
5.2-(8.2/x) = 0
5.2-8.2*x^-1 = 0
-8.2*x^-1 = -5.2 // : -8.2
x^-1 = 0.63414634
-1 < 0
1/(x^1) = 0.63414634 // * x^1
1 = 0.63414634*x^1 // : 0.63414634
1.57692308 = x^1
x = 1.57692308
x = 1.57692308
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