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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
38/x = 80 // - 80
38/x-80 = 0
38*x^-1 = 80 // : 38
x^-1 = 40/19
-1 < 0
1/(x^1) = 40/19 // * x^1
1 = 40/19*x^1 // : 40/19
19/40 = x^1
x = 19/40
x = 19/40
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