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n in (-oo:+oo)
(1/2)*n-6 = (-3/8)*n+4 // - (-3/8)*n+4
(1/2)*n-((-3/8)*n)-6-4 = 0
(1/2)*n+(3/8)*n-6-4 = 0
7/8*n-10 = 0 // + 10
7/8*n = 10 // : 7/8
n = 10/7/8
n = 80/7
n = 80/7
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