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