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n in (-oo:+oo)
n+56/2 = 4*n // - 4*n
n-(4*n)+56/2 = 0
n-4*n+56/2 = 0
28-3*n = 0 // - 28
-3*n = -28 // : -3
n = -28/(-3)
n = 28/3
n = 28/3
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