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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 1.5 // - 1.5
8/x-1.5 = 0
8*x^-1 = 1.5 // : 8
x^-1 = 0.1875
-1 < 0
1/(x^1) = 0.1875 // * x^1
1 = 0.1875*x^1 // : 0.1875
5.33333333 = x^1
x = 5.33333333
x = 5.33333333
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