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