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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 80/100 // - 80/100
10/x-(80/100) = 0
10/x-4/5 = 0
10*x^-1 = 4/5 // : 10
x^-1 = 2/25
-1 < 0
1/(x^1) = 2/25 // * x^1
1 = 2/25*x^1 // : 2/25
25/2 = x^1
x = 25/2
x = 25/2
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