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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/10)/14 = 410/x // - 410/x
(5/10)/14-(410/x) = 0
(5/10)/14-410*x^-1 = 0
-410*x^-1 = -1/28 // : -410
x^-1 = 1/11480
-1 < 0
1/(x^1) = 1/11480 // * x^1
1 = 1/11480*x^1 // : 1/11480
11480 = x^1
x = 11480
x = 11480
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