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n in (-oo:+oo)
65 = 4*n+6*n+5 // - 4*n+6*n+5
65-(4*n)-(6*n)-5 = 0
65-4*n-6*n-5 = 0
60-10*n = 0 // - 60
-10*n = -60 // : -10
n = -60/(-10)
n = 6
n = 6
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