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n in (-oo:+oo)
6-5*n = 3*n+54 // - 3*n+54
6-5*n-(3*n)-54 = 0
6-5*n-3*n-54 = 0
-8*n-48 = 0 // + 48
-8*n = 48 // : -8
n = 48/(-8)
n = -6
n = -6
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