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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 6/8 // - 6/8
10/x-(6/8) = 0
10/x-3/4 = 0
10*x^-1 = 3/4 // : 10
x^-1 = 3/40
-1 < 0
1/(x^1) = 3/40 // * x^1
1 = 3/40*x^1 // : 3/40
40/3 = x^1
x = 40/3
x = 40/3
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