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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/48 = -(5/x) // + 5/x
5/x+3/48 = 0
5*x^-1 = -1/16 // : 5
x^-1 = -1/80
-1 < 0
1/(x^1) = -1/80 // * x^1
1 = -1/80*x^1 // : -1/80
-80 = x^1
x = -80
x = -80
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