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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
26/13 = 16/x // - 16/x
26/13-(16/x) = 0
26/13-16*x^-1 = 0
-16*x^-1 = -2 // : -16
x^-1 = 1/8
-1 < 0
1/(x^1) = 1/8 // * x^1
1 = 1/8*x^1 // : 1/8
8 = x^1
x = 8
x = 8
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