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U in (-oo:+oo)
U/2 = 15/10 // - 15/10
U/2-(15/10) = 0
U/2-3/2 = 0
1/2*U-3/2 = 0 // + 3/2
1/2*U = 3/2 // : 1/2
U = 3/2/1/2
U = 3
U = 3
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