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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8-((31*x^2)/x)-10 > 0
8-31*x-10 > 0
-31*x-2 > 0 // + 2
-31*x > 2 // : -31
x < 2/(-31)
x < -2/31
x in (-oo:-2/31)
(-oo:-2/31)
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