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n in (-oo:+oo)
65 = 2*n+4*n+5 // - 2*n+4*n+5
65-(2*n)-(4*n)-5 = 0
65-2*n-4*n-5 = 0
60-6*n = 0 // - 60
-6*n = -60 // : -6
n = -60/(-6)
n = 10
n = 10
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