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u in (-oo:+oo)
9/5 = 3*u // - 3*u
9/5-(3*u) = 0
9/5-3*u = 0
9/5-3*u = 0 // - 9/5
-3*u = -9/5 // : -3
u = -9/5/(-3)
u = 3/5
u = 3/5
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