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n in (-oo:+oo)
(1/2)*n-((5/6)*n)+7/8 = 17/24 // - 17/24
(1/2)*n-((5/6)*n)+7/8-(17/24) = 0
(-5/6)*n+(1/2)*n+7/8-17/24 = 0
1/6-1/3*n = 0 // - 1/6
-1/3*n = -1/6 // : -1/3
n = -1/6/(-1/3)
n = 1/2
n = 1/2
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