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