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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.26 = 16/x // - 16/x
0.26-(16/x) = 0
0.26-16*x^-1 = 0
-16*x^-1 = -0.26 // : -16
x^-1 = 0.01625
-1 < 0
1/(x^1) = 0.01625 // * x^1
1 = 0.01625*x^1 // : 0.01625
61.53846154 = x^1
x = 61.53846154
x = 61.53846154
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