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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+1/3 = 5/9 // - 5/9
4/x+1/3-(5/9) = 0
4/x+1/3-5/9 = 0
4*x^-1 = 2/9 // : 4
x^-1 = 1/18
-1 < 0
1/(x^1) = 1/18 // * x^1
1 = 1/18*x^1 // : 1/18
18 = x^1
x = 18
x = 18
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