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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 10/24 // - 10/24
18/x-(10/24) = 0
18/x-5/12 = 0
18*x^-1 = 5/12 // : 18
x^-1 = 5/216
-1 < 0
1/(x^1) = 5/216 // * x^1
1 = 5/216*x^1 // : 5/216
216/5 = x^1
x = 216/5
x = 216/5
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