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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+4/3 = 0
6*x^-1 = -4/3 // : 6
x^-1 = -2/9
-1 < 0
1/(x^1) = -2/9 // * x^1
1 = -2/9*x^1 // : -2/9
-9/2 = x^1
x = -9/2
x = -9/2
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