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