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n in (-oo:+oo)
(1/2)*n-14 = 4*n // - 4*n
(1/2)*n-(4*n)-14 = 0
(1/2)*n-4*n-14 = 0
-7/2*n-14 = 0 // + 14
-7/2*n = 14 // : -7/2
n = 14/(-7/2)
n = -4
n = -4
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