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u in (-oo:+oo)
(2/3)*(4*u-5) = 0
2/3*(4*u-5) = 0
( 2/3 )
2/3 = 0
u belongs to the empty set
( 4*u-5 )
4*u-5 = 0 // + 5
4*u = 5 // : 4
u = 5/4
u = 5/4
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