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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-6/x = 10/8 // - 10/8
-6/x-(10/8) = 0
-6/x-5/4 = 0
-6*x^-1 = 5/4 // : -6
x^-1 = -5/24
-1 < 0
1/(x^1) = -5/24 // * x^1
1 = -5/24*x^1 // : -5/24
-24/5 = x^1
x = -24/5
x = -24/5
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