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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23/5 = 2/x // - 2/x
23/5-(2/x) = 0
23/5-2*x^-1 = 0
-2*x^-1 = -23/5 // : -2
x^-1 = 23/10
-1 < 0
1/(x^1) = 23/10 // * x^1
1 = 23/10*x^1 // : 23/10
10/23 = x^1
x = 10/23
x = 10/23
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