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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = 15/18 // - 15/18
24/x-(15/18) = 0
24/x-5/6 = 0
24*x^-1 = 5/6 // : 24
x^-1 = 5/144
-1 < 0
1/(x^1) = 5/144 // * x^1
1 = 5/144*x^1 // : 5/144
144/5 = x^1
x = 144/5
x = 144/5
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