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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x-6 = 40/5 // - 40/5
16/x-(40/5)-6 = 0
16/x-8-6 = 0
16*x^-1 = 14 // : 16
x^-1 = 7/8
-1 < 0
1/(x^1) = 7/8 // * x^1
1 = 7/8*x^1 // : 7/8
8/7 = x^1
x = 8/7
x = 8/7
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