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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9.5/7 = 8/x // - 8/x
9.5/7-(8/x) = 0
9.5/7-8*x^-1 = 0
-8*x^-1 = -1.35714286 // : -8
x^-1 = 0.16964286
-1 < 0
1/(x^1) = 0.16964286 // * x^1
1 = 0.16964286*x^1 // : 0.16964286
5.89473674 = x^1
x = 5.89473674
x = 5.89473674
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