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n in (-oo:+oo)
5/2 = 3*n-(9/5) // - 3*n-(9/5)
5/2-(3*n)+9/5 = 0
5/2-3*n+9/5 = 0
43/10-3*n = 0 // - 43/10
-3*n = -43/10 // : -3
n = -43/10/(-3)
n = 43/30
n = 43/30
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