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U in (-oo:+oo)
U/3 = 19.2 // - 19.2
U/3-19.2 = 0
1/3*U-19.2 = 0 // + 19.2
1/3*U = 19.2 // : 1/3
U = 19.2/1/3
U = 57.60000058
U = 57.60000058
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