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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+x/(x^2)-25-5 = 4/x+5 // - 4/x+5
2/x+x/(x^2)-(4/x)-25-5-5 = 0
2/x+x/(x^2)-4*x^-1-25-5-5 = 0
-1*x^-1 = 35 // : -1
x^-1 = -35
-1 < 0
1/(x^1) = -35 // * x^1
1 = -35*x^1 // : -35
-1/35 = x^1
x = -1/35
x = -1/35
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