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u in (-oo:+oo)
u/11.2 = 7 // - 7
u/11.2-7 = 0
0.08928571*u-7 = 0 // + 7
0.08928571*u = 7 // : 0.08928571
u = 7/0.08928571
u = 78.40000376
u = 78.40000376
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