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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 2292 // - 2292
1/x-2292 = 0
1*x^-1 = 2292 // : 1
x^-1 = 2292
-1 < 0
1/(x^1) = 2292 // * x^1
1 = 2292*x^1 // : 2292
1/2292 = x^1
x = 1/2292
x = 1/2292
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