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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45/6 = 26/x // - 26/x
45/6-(26/x) = 0
45/6-26*x^-1 = 0
-26*x^-1 = -15/2 // : -26
x^-1 = 15/52
-1 < 0
1/(x^1) = 15/52 // * x^1
1 = 15/52*x^1 // : 15/52
52/15 = x^1
x = 52/15
x = 52/15
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