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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
806/x = 368 // - 368
806/x-368 = 0
806*x^-1 = 368 // : 806
x^-1 = 184/403
-1 < 0
1/(x^1) = 184/403 // * x^1
1 = 184/403*x^1 // : 184/403
403/184 = x^1
x = 403/184
x = 403/184
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