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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/7 = 24/x+11 // - 24/x+11
4/7-(24/x)-11 = 0
4/7-24*x^-1-11 = 0
-24*x^-1 = 73/7 // : -24
x^-1 = -73/168
-1 < 0
1/(x^1) = -73/168 // * x^1
1 = -73/168*x^1 // : -73/168
-168/73 = x^1
x = -168/73
x = -168/73
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