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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40/1 = 29/x // - 29/x
40/1-(29/x) = 0
40-29*x^-1 = 0
-29*x^-1 = -40 // : -29
x^-1 = 40/29
-1 < 0
1/(x^1) = 40/29 // * x^1
1 = 40/29*x^1 // : 40/29
29/40 = x^1
x = 29/40
x = 29/40
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