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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.2 = 16/x // - 16/x
1.2-(16/x) = 0
1.2-16*x^-1 = 0
-16*x^-1 = -1.2 // : -16
x^-1 = 0.075
-1 < 0
1/(x^1) = 0.075 // * x^1
1 = 0.075*x^1 // : 0.075
13.33333333 = x^1
x = 13.33333333
x = 13.33333333
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