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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23/19 = 42/x // - 42/x
23/19-(42/x) = 0
23/19-42*x^-1 = 0
-42*x^-1 = -23/19 // : -42
x^-1 = 23/798
-1 < 0
1/(x^1) = 23/798 // * x^1
1 = 23/798*x^1 // : 23/798
798/23 = x^1
x = 798/23
x = 798/23
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