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u in (-oo:+oo)
10/7 = 5*u // - 5*u
10/7-(5*u) = 0
10/7-5*u = 0
10/7-5*u = 0 // - 10/7
-5*u = -10/7 // : -5
u = -10/7/(-5)
u = 2/7
u = 2/7
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