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U in (-oo:+oo)
U/7 = -9.8 // + 9.8
U/7+9.8 = 0
1/7*U+9.8 = 0 // - 9.8
1/7*U = -9.8 // : 1/7
U = -9.8/1/7
U = -68.60000137
U = -68.60000137
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