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n in (-oo:+oo)
8-4*n-((4/5)*n) = 32/5 // - 32/5
8-4*n-((4/5)*n)-(32/5) = 0
(-4/5)*n-4*n-32/5+8 = 0
8/5-24/5*n = 0 // - 8/5
-24/5*n = -8/5 // : -24/5
n = -8/5/(-24/5)
n = 1/3
n = 1/3
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