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U in (-oo:+oo)
(2/3)*U-(7/4) = -8/5 // + -8/5
(2/3)*U-(7/4)-(-8/5) = 0
(2/3)*U-7/4+8/5 = 0
2/3*U-3/20 = 0 // + 3/20
2/3*U = 3/20 // : 2/3
U = 3/20/2/3
U = 9/40
U = 9/40
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