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