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u in (-oo:+oo)
6/5 = 3*u // - 3*u
6/5-(3*u) = 0
6/5-3*u = 0
6/5-3*u = 0 // - 6/5
-3*u = -6/5 // : -3
u = -6/5/(-3)
u = 2/5
u = 2/5
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