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n in (-oo:+oo)
(1/2)*n-(4*n)+8 = -27 // + 27
(1/2)*n-(4*n)+8+27 = 0
(1/2)*n-4*n+8+27 = 0
35-7/2*n = 0 // - 35
-7/2*n = -35 // : -7/2
n = -35/(-7/2)
n = 10
n = 10
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