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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 5/22 // - 5/22
4/x-(5/22) = 0
4/x-5/22 = 0
4*x^-1 = 5/22 // : 4
x^-1 = 5/88
-1 < 0
1/(x^1) = 5/88 // * x^1
1 = 5/88*x^1 // : 5/88
88/5 = x^1
x = 88/5
x = 88/5
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