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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.8/x = 2.2 // - 2.2
8.8/x-2.2 = 0
8.8*x^-1 = 2.2 // : 8.8
x^-1 = 0.25
-1 < 0
1/(x^1) = 0.25 // * x^1
1 = 0.25*x^1 // : 0.25
4 = x^1
x = 4
x = 4
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