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U in (-oo:+oo)
U/4 = 5/11 // - 5/11
U/4-(5/11) = 0
U/4-5/11 = 0
1/4*U-5/11 = 0 // + 5/11
1/4*U = 5/11 // : 1/4
U = 5/11/1/4
U = 20/11
U = 20/11
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