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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-(4/x)-4 = 5/12 // - 5/12
6/x-(4/x)-(5/12)-4 = 0
6/x-4*x^-1-5/12-4 = 0
2*x^-1 = 53/12 // : 2
x^-1 = 53/24
-1 < 0
1/(x^1) = 53/24 // * x^1
1 = 53/24*x^1 // : 53/24
24/53 = x^1
x = 24/53
x = 24/53
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