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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
325/15 = 800/x // - 800/x
325/15-(800/x) = 0
325/15-800*x^-1 = 0
-800*x^-1 = -65/3 // : -800
x^-1 = 13/480
-1 < 0
1/(x^1) = 13/480 // * x^1
1 = 13/480*x^1 // : 13/480
480/13 = x^1
x = 480/13
x = 480/13
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