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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/57 = 2/x // - 2/x
3/57-(2/x) = 0
3/57-2*x^-1 = 0
-2*x^-1 = -1/19 // : -2
x^-1 = 1/38
-1 < 0
1/(x^1) = 1/38 // * x^1
1 = 1/38*x^1 // : 1/38
38 = x^1
x = 38
x = 38
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