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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3914-((x^0)/9) = 2*x // - 2*x
3914-(2*x)-((x^0)/9) = 0
3914-2*x-1/9 = 0
35225/9-2*x = 0 // - 35225/9
-2*x = -35225/9 // : -2
x = -35225/9/(-2)
x = 35225/18
x = 35225/18
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