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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 25/19 // - 25/19
2/x-(25/19) = 0
2/x-25/19 = 0
2*x^-1 = 25/19 // : 2
x^-1 = 25/38
-1 < 0
1/(x^1) = 25/38 // * x^1
1 = 25/38*x^1 // : 25/38
38/25 = x^1
x = 38/25
x = 38/25
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