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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 5/12 // - 5/12
6/x-(5/12) = 0
6/x-5/12 = 0
6*x^-1 = 5/12 // : 6
x^-1 = 5/72
-1 < 0
1/(x^1) = 5/72 // * x^1
1 = 5/72*x^1 // : 5/72
72/5 = x^1
x = 72/5
x = 72/5
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