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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.25/x = 1.1 // - 1.1
0.25/x-1.1 = 0
0.25*x^-1 = 1.1 // : 0.25
x^-1 = 4.4
-1 < 0
1/(x^1) = 4.4 // * x^1
1 = 4.4*x^1 // : 4.4
0.22727273 = x^1
x = 0.22727273
x = 0.22727273
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