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D( x )
24-(8*x) = 0
24-(8*x) = 0
24-(8*x) = 0
24-8*x = 0
24-8*x = 0 // - 24
-8*x = -24 // : -8
x = -24/(-8)
x = 3
x in (-oo:3) U (3:+oo)
152/(24-(8*x)) = 0
152/(24-8*x) = 0
x belongs to the empty set
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