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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 7/3-(6/x) // - 7/3-(6/x)
6/x-(7/3)+4 = 0
6/x-7/3+4 = 0
6*x^-1 = -5/3 // : 6
x^-1 = -5/18
-1 < 0
1/(x^1) = -5/18 // * x^1
1 = -5/18*x^1 // : -5/18
-18/5 = x^1
x = -18/5
x = -18/5
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