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