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n in (-oo:+oo)
n-(6*n)+5 = 65 // - 65
n-(6*n)-65+5 = 0
n-6*n-65+5 = 0
-5*n-60 = 0 // + 60
-5*n = 60 // : -5
n = 60/(-5)
n = -12
n = -12
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