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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
80/x = 166/11 // - 166/11
80/x-(166/11) = 0
80/x-166/11 = 0
80*x^-1 = 166/11 // : 80
x^-1 = 83/440
-1 < 0
1/(x^1) = 83/440 // * x^1
1 = 83/440*x^1 // : 83/440
440/83 = x^1
x = 440/83
x = 440/83
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