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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-3/y-4 = -4 // + 4
4-3/y-4 = 0
-3*y^-1 = 0 // : -3
y^-1 = 0
y naleu017Cy do O
y belongs to the empty set
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