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n in (-oo:+oo)
-73/154 = (4/7)*n+(1/2)*n+1/2 // - (4/7)*n+(1/2)*n+1/2
-((4/7)*n)-((1/2)*n)-73/154-(1/2) = 0
(-4/7)*n+(-1/2)*n-73/154-1/2 = 0
-15/14*n-75/77 = 0 // + 75/77
-15/14*n = 75/77 // : -15/14
n = 75/77/(-15/14)
n = -10/11
n = -10/11
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