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n in (-oo:+oo)
-n-(3*n)-4/5 = 116/5 // - 116/5
-n-(3*n)-4/5-(116/5) = 0
-n-3*n-4/5-116/5 = 0
-4*n-24 = 0 // + 24
-4*n = 24 // : -4
n = 24/(-4)
n = -6
n = -6
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