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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/2 = 2/x // - 2/x
10/2-(2/x) = 0
10/2-2*x^-1 = 0
-2*x^-1 = -5 // : -2
x^-1 = 5/2
-1 < 0
1/(x^1) = 5/2 // * x^1
1 = 5/2*x^1 // : 5/2
2/5 = x^1
x = 2/5
x = 2/5
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