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n in (-oo:+oo)
-(5*n)-4/5 = 164/45 // - 164/45
-(5*n)-4/5-(164/45) = 0
-5*n-4/5-164/45 = 0
-5*n-40/9 = 0 // + 40/9
-5*n = 40/9 // : -5
n = 40/9/(-5)
n = -8/9
n = -8/9
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