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n in (-oo:+oo)
73/15 = 3*n+3*n+2/3 // - 3*n+3*n+2/3
73/15-(3*n)-(3*n)-(2/3) = 0
73/15-3*n-3*n-2/3 = 0
21/5-6*n = 0 // - 21/5
-6*n = -21/5 // : -6
n = -21/5/(-6)
n = 7/10
n = 7/10
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