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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22/x = 84 // - 84
22/x-84 = 0
22*x^-1 = 84 // : 22
x^-1 = 42/11
-1 < 0
1/(x^1) = 42/11 // * x^1
1 = 42/11*x^1 // : 42/11
11/42 = x^1
x = 11/42
x = 11/42
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