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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/4 = 24/y // - 24/y
3/4-(24/y) = 0
3/4-24*y^-1 = 0
-24*y^-1 = -3/4 // : -24
y^-1 = 1/32
-1 < 0
1/(y^1) = 1/32 // * y^1
1 = 1/32*y^1 // : 1/32
32 = y^1
y = 32
y = 32
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