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u in (-oo:+oo)
7 = u/17.5 // - u/17.5
7-(u/17.5) = 0
7-0.05714286*u = 0
7-0.05714286*u = 0 // - 7
-0.05714286*u = -7 // : -0.05714286
u = -7/(-0.05714286)
u = 122.49999388
u = 122.49999388
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