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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+25 = 2/x+5 // - 2/x+5
6/x-(2/x)-5+25 = 0
6/x-2*x^-1-5+25 = 0
4*x^-1 = -20 // : 4
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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