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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/8 = 11/x // - 11/x
2/8-(11/x) = 0
2/8-11*x^-1 = 0
-11*x^-1 = -1/4 // : -11
x^-1 = 1/44
-1 < 0
1/(x^1) = 1/44 // * x^1
1 = 1/44*x^1 // : 1/44
44 = x^1
x = 44
x = 44
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