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