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u in (-oo:+oo)
6*(2/3-(2*u)) = 0
6*(2/3-2*u) = 0
( 2/3-2*u )
2/3-2*u = 0 // - 2/3
-2*u = -2/3 // : -2
u = -2/3/(-2)
u = 1/3
( 6 )
6 = 0
u belongs to the empty set
u = 1/3
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