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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x = (7/3)*(1/34) // - (7/3)*(1/34)
16/x-((7/3)*(1/34)) = 0
16/x-7/102 = 0
16*x^-1 = 7/102 // : 16
x^-1 = 7/1632
-1 < 0
1/(x^1) = 7/1632 // * x^1
1 = 7/1632*x^1 // : 7/1632
1632/7 = x^1
x = 1632/7
x = 1632/7
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