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