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n in (-oo:+oo)
9/2 = 3*n-(3/2) // - 3*n-(3/2)
9/2-(3*n)+3/2 = 0
9/2-3*n+3/2 = 0
6-3*n = 0 // - 6
-3*n = -6 // : -3
n = -6/(-3)
n = 2
n = 2
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