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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2-(5/x) = 10/x-1 // - 10/x-1
1-(5/x)-(10/x)+2 = 0
1-5*x^-1-10*x^-1+2 = 0
-15*x^-1 = -3 // : -15
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
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