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