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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
24/y-3 = 0
24*y^-1 = 3 // : 24
y^-1 = 1/8
-1 < 0
1/(y^1) = 1/8 // * y^1
1 = 1/8*y^1 // : 1/8
8 = y^1
y = 8
y = 8
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