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