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