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n in (-oo:+oo)
(1/8)*n-7 = (1/4)*n-13 // - (1/4)*n-13
(1/8)*n-((1/4)*n)-7+13 = 0
(1/8)*n+(-1/4)*n-7+13 = 0
6-1/8*n = 0 // - 6
-1/8*n = -6 // : -1/8
n = -6/(-1/8)
n = 48
n = 48
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