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u in (-oo:+oo)
8*(3/2-(3*u)) = 0
8*(3/2-3*u) = 0
( 3/2-3*u )
3/2-3*u = 0 // - 3/2
-3*u = -3/2 // : -3
u = -3/2/(-3)
u = 1/2
( 8 )
8 = 0
u belongs to the empty set
u = 1/2
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