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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 3/22 // - 3/22
6/x-(3/22) = 0
6/x-3/22 = 0
6*x^-1 = 3/22 // : 6
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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