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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-10 = 4/8 // - 4/8
5/x-(4/8)-10 = 0
5/x-1/2-10 = 0
5*x^-1 = 21/2 // : 5
x^-1 = 21/10
-1 < 0
1/(x^1) = 21/10 // * x^1
1 = 21/10*x^1 // : 21/10
10/21 = x^1
x = 10/21
x = 10/21
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