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D( x )
x+13 = 0
x-13 = 0
x+13 = 0
x+13 = 0
x+13 = 0 // - 13
x = -13
x-13 = 0
x-13 = 0
x-13 = 0 // + 13
x = 13
x in (-oo:-13) U (-13:13) U (13:+oo)
13/(x-13)+1 = x/(x+13) // - x/(x+13)
13/(x-13)-(x/(x+13))+1 = 0
13/(x-13)+(-1*x)/(x+13)+1 = 0
(13*(x+13))/((x-13)*(x+13))+(-1*x*(x-13))/((x-13)*(x+13))+(1*(x-13)*(x+13))/((x-13)*(x+13)) = 0
13*(x+13)-1*x*(x-13)+1*(x-13)*(x+13) = 0
x^2-x^2+26*x-169+169 = 0
26*x = 0
(26*x)/((x-13)*(x+13)) = 0
(26*x)/((x-13)*(x+13)) = 0 // * (x-13)*(x+13)
26*x = 0
26*x = 0 // : 26
x = 0
x = 0
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