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n in (-oo:+oo)
9-(1/2) = 4*n+5 // - 4*n+5
9-(4*n)-(1/2)-5 = 0
9-4*n-1/2-5 = 0
7/2-4*n = 0 // - 7/2
-4*n = -7/2 // : -4
n = -7/2/(-4)
n = 7/8
n = 7/8
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