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D( u )
u-8 = 0
u-8 = 0
u-8 = 0
u-8 = 0 // + 8
u = 8
u in (-oo:8) U (8:+oo)
(5*(u-6))/(u-8) = 0
( 5 )
5 = 0
u belongs to the empty set
( u-6 )
u-6 = 0 // + 6
u = 6
u = 6
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