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