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U in (-oo:+oo)
U/3-3.1 = -7.9 // + 7.9
U/3-3.1+7.9 = 0
1/3*U+4.8 = 0 // - 4.8
1/3*U = -4.8 // : 1/3
U = -4.8/1/3
U = -14.40000014
U = -14.40000014
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