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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8-((5*x^2)/x)-2 = 0
8-5*x-2 = 0
6-5*x = 0 // - 6
-5*x = -6 // : -5
x = -6/(-5)
x = 6/5
x = 6/5
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