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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
62/x = 16/12 // - 16/12
62/x-(16/12) = 0
62/x-4/3 = 0
62*x^-1 = 4/3 // : 62
x^-1 = 2/93
-1 < 0
1/(x^1) = 2/93 // * x^1
1 = 2/93*x^1 // : 2/93
93/2 = x^1
x = 93/2
x = 93/2
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