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n in (-oo:+oo)
9-((1/2)*n) = 1-((1/8)*n) // - 1-((1/8)*n)
(1/8)*n-((1/2)*n)-1+9 = 0
(-1/2)*n+(1/8)*n-1+9 = 0
8-3/8*n = 0 // - 8
-3/8*n = -8 // : -3/8
n = -8/(-3/8)
n = 64/3
n = 64/3
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