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