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