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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+1/y+5 = y-(2/y)+1+4 // - y-(2/y)+1+4
y-y+1/y+2/y-4-1+5 = 0
3*y^-1 = 0 // : 3
y^-1 = 0
y naleu017Cy do O
y belongs to the empty set
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