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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+2 = 16/9 // - 16/9
4/x-(16/9)+2 = 0
4/x-16/9+2 = 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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