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n in (-oo:+oo)
n+1/2 = 6*n+51/2 // - 6*n+51/2
n-(6*n)+1/2-(51/2) = 0
n-6*n+1/2-51/2 = 0
-5*n-25 = 0 // + 25
-5*n = 25 // : -5
n = 25/(-5)
n = -5
n = -5
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