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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
44/x = 2 // - 2
44/x-2 = 0
44*x^-1 = 2 // : 44
x^-1 = 1/22
-1 < 0
1/(x^1) = 1/22 // * x^1
1 = 1/22*x^1 // : 1/22
22 = x^1
x = 22
x = 22
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