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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+1 = 5/x+13 // - 5/x+13
2/x-(5/x)-13+1 = 0
2/x-5*x^-1-13+1 = 0
-3*x^-1 = 12 // : -3
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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