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n in (-oo:+oo)
n+4 = 4*n-20 // - 4*n-20
n-(4*n)+4+20 = 0
n-4*n+4+20 = 0
24-3*n = 0 // - 24
-3*n = -24 // : -3
n = -24/(-3)
n = 8
n = 8
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