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D( y )
4*y-15 = 0
4*y-15 = 0
4*y-15 = 0
4*y-15 = 0 // + 15
4*y = 15 // : 4
y = 15/4
y in (-oo:15/4) U (15/4:+oo)
1/(4*y-15) = 0
y belongs to the empty set
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