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u in (-oo:+oo)
9/2 = 3*u // - 3*u
9/2-(3*u) = 0
9/2-3*u = 0
9/2-3*u = 0 // - 9/2
-3*u = -9/2 // : -3
u = -9/2/(-3)
u = 3/2
u = 3/2
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