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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.345 = 16/x // - 16/x
0.345-(16/x) = 0
0.345-16*x^-1 = 0
-16*x^-1 = -0.345 // : -16
x^-1 = 0.0215625
-1 < 0
1/(x^1) = 0.0215625 // * x^1
1 = 0.0215625*x^1 // : 0.0215625
46.37681159 = x^1
x = 46.37681159
x = 46.37681159
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