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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/19 = 3/x // - 3/x
7/19-(3/x) = 0
7/19-3*x^-1 = 0
-3*x^-1 = -7/19 // : -3
x^-1 = 7/57
-1 < 0
1/(x^1) = 7/57 // * x^1
1 = 7/57*x^1 // : 7/57
57/7 = x^1
x = 57/7
x = 57/7
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