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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40/92 = 20/x // - 20/x
40/92-(20/x) = 0
40/92-20*x^-1 = 0
-20*x^-1 = -10/23 // : -20
x^-1 = 1/46
-1 < 0
1/(x^1) = 1/46 // * x^1
1 = 1/46*x^1 // : 1/46
46 = x^1
x = 46
x = 46
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