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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4-(3/x) = 6-(5/x) // - 6-(5/x)
5/x-(3/x)-6+4 = 0
5/x-3*x^-1-6+4 = 0
2*x^-1 = 2 // : 2
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x = 1
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