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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y-(5/y)+8/y-6+6 = 0
4/y-5*y^-1+8/y-6+6 = 0
7*y^-1 = 0 // : 7
y^-1 = 0
y naleu017Cy do O
y belongs to the empty set
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