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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/6 = 13/x // - 13/x
5/6-(13/x) = 0
5/6-13*x^-1 = 0
-13*x^-1 = -5/6 // : -13
x^-1 = 5/78
-1 < 0
1/(x^1) = 5/78 // * x^1
1 = 5/78*x^1 // : 5/78
78/5 = x^1
x = 78/5
x = 78/5
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