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n in (-oo:+oo)
61 = 5*n+3*n+5 // - 5*n+3*n+5
61-(5*n)-(3*n)-5 = 0
61-5*n-3*n-5 = 0
56-8*n = 0 // - 56
-8*n = -56 // : -8
n = -56/(-8)
n = 7
n = 7
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