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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/285 = 8/x // - 8/x
10/285-(8/x) = 0
10/285-8*x^-1 = 0
-8*x^-1 = -2/57 // : -8
x^-1 = 1/228
-1 < 0
1/(x^1) = 1/228 // * x^1
1 = 1/228*x^1 // : 1/228
228 = x^1
x = 228
x = 228
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