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U in (-oo:+oo)
U/3 = 4/36 // - 4/36
U/3-(4/36) = 0
U/3-1/9 = 0
1/3*U-1/9 = 0 // + 1/9
1/3*U = 1/9 // : 1/3
U = 1/9/1/3
U = 1/3
U = 1/3
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