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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/2.875 = 16/x // - 16/x
3/2.875-(16/x) = 0
3/2.875-16*x^-1 = 0
-16*x^-1 = -1.04347826 // : -16
x^-1 = 0.06521739
-1 < 0
1/(x^1) = 0.06521739 // * x^1
1 = 0.06521739*x^1 // : 0.06521739
15.33333364 = x^1
x = 15.33333364
x = 15.33333364
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