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