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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-5 = 35/x+1 // - 35/x+1
5/x-(35/x)-5-1 = 0
5/x-35*x^-1-5-1 = 0
-30*x^-1 = 6 // : -30
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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