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n in (-oo:+oo)
n-(5*n)+1/10 = 21/10 // - 21/10
n-(5*n)+1/10-(21/10) = 0
n-5*n+1/10-21/10 = 0
-4*n-2 = 0 // + 2
-4*n = 2 // : -4
n = 2/(-4)
n = -1/2
n = -1/2
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