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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/6 = 10/x // - 10/x
8/6-(10/x) = 0
8/6-10*x^-1 = 0
-10*x^-1 = -4/3 // : -10
x^-1 = 2/15
-1 < 0
1/(x^1) = 2/15 // * x^1
1 = 2/15*x^1 // : 2/15
15/2 = x^1
x = 15/2
x = 15/2
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