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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19/x = 9/5 // - 9/5
19/x-(9/5) = 0
19/x-9/5 = 0
19*x^-1 = 9/5 // : 19
x^-1 = 9/95
-1 < 0
1/(x^1) = 9/95 // * x^1
1 = 9/95*x^1 // : 9/95
95/9 = x^1
x = 95/9
x = 95/9
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