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n in (-oo:+oo)
33 = n+5*n+3 // - n+5*n+3
33-n-(5*n)-3 = 0
33-n-5*n-3 = 0
30-6*n = 0 // - 30
-6*n = -30 // : -6
n = -30/(-6)
n = 5
n = 5
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