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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
26/x = 40/8 // - 40/8
26/x-(40/8) = 0
26/x-5 = 0
26*x^-1 = 5 // : 26
x^-1 = 5/26
-1 < 0
1/(x^1) = 5/26 // * x^1
1 = 5/26*x^1 // : 5/26
26/5 = x^1
x = 26/5
x = 26/5
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