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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-6 = 5/12 // - 5/12
10/x-(5/12)-6 = 0
10/x-5/12-6 = 0
10*x^-1 = 77/12 // : 10
x^-1 = 77/120
-1 < 0
1/(x^1) = 77/120 // * x^1
1 = 77/120*x^1 // : 77/120
120/77 = x^1
x = 120/77
x = 120/77
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