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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19/5 = 6/x // - 6/x
19/5-(6/x) = 0
19/5-6*x^-1 = 0
-6*x^-1 = -19/5 // : -6
x^-1 = 19/30
-1 < 0
1/(x^1) = 19/30 // * x^1
1 = 19/30*x^1 // : 19/30
30/19 = x^1
x = 30/19
x = 30/19
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