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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5 = x/x-(5/x) // - x/x-(5/x)
5/x-(x/x)+0.5 = 0
5/x-1+0.5 = 0
5*x^-1 = 0.5 // : 5
x^-1 = 0.1
-1 < 0
1/(x^1) = 0.1 // * x^1
1 = 0.1*x^1 // : 0.1
10 = x^1
x = 10
x = 10
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