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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 8/5 // - 8/5
3/x-(8/5) = 0
3/x-8/5 = 0
3*x^-1 = 8/5 // : 3
x^-1 = 8/15
-1 < 0
1/(x^1) = 8/15 // * x^1
1 = 8/15*x^1 // : 8/15
15/8 = x^1
x = 15/8
x = 15/8
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