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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/80 = 11/x // - 11/x
10/80-(11/x) = 0
10/80-11*x^-1 = 0
-11*x^-1 = -1/8 // : -11
x^-1 = 1/88
-1 < 0
1/(x^1) = 1/88 // * x^1
1 = 1/88*x^1 // : 1/88
88 = x^1
x = 88
x = 88
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