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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/8 = -2/x // + -2/x
5/8-(-2/x) = 0
2*x^-1+5/8 = 0
2*x^-1 = -5/8 // : 2
x^-1 = -5/16
-1 < 0
1/(x^1) = -5/16 // * x^1
1 = -5/16*x^1 // : -5/16
-16/5 = x^1
x = -16/5
x = -16/5
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