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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x = 3/14 // - 3/14
16/x-(3/14) = 0
16/x-3/14 = 0
16*x^-1 = 3/14 // : 16
x^-1 = 3/224
-1 < 0
1/(x^1) = 3/224 // * x^1
1 = 3/224*x^1 // : 3/224
224/3 = x^1
x = 224/3
x = 224/3
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