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U in (-oo:+oo)
7 = U/8.96 // - U/8.96
7-(U/8.96) = 0
7-0.11160714*U = 0
7-0.11160714*U = 0 // - 7
-0.11160714*U = -7 // : -0.11160714
U = -7/(-0.11160714)
U = 62.72000161
U = 62.72000161
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