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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-434/x = -2760 // + 2760
2760-434/x = 0
-434*x^-1 = -2760 // : -434
x^-1 = 1380/217
-1 < 0
1/(x^1) = 1380/217 // * x^1
1 = 1380/217*x^1 // : 1380/217
217/1380 = x^1
x = 217/1380
x = 217/1380
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