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n in (-oo:+oo)
n/3 = 4*n-77 // - 4*n-77
n/3-(4*n)+77 = 0
n/3-4*n+77 = 0
77-11/3*n = 0 // - 77
-11/3*n = -77 // : -11/3
n = -77/(-11/3)
n = 21
n = 21
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