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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+4 = 9 // - 9
3/x-9+4 = 0
3*x^-1 = 5 // : 3
x^-1 = 5/3
-1 < 0
1/(x^1) = 5/3 // * x^1
1 = 5/3*x^1 // : 5/3
3/5 = x^1
x = 3/5
x = 3/5
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