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