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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
13/y+3 = 9/y+3 // - 9/y+3
13/y-(9/y)-3+3 = 0
13/y-9*y^-1-3+3 = 0
4*y^-1 = 0 // : 4
y^-1 = 0
y naleu017Cy do O
y belongs to the empty set
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