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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8*x^(-5/13)+8 = 0
8*x^(-5/13) = -8 // : 8
x^(-5/13) = -1
-5/13 < 0
1/(x^(5/13)) = -1 // * x^(5/13)
1 = -1*x^(5/13) // : -1
-1 = x^(5/13)
x^(5/13) = -1 // ^ 13
x^5 = -1 // ^ 1/5
x = -1
x = -1
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