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n in (-oo:+oo)
-5 = 6*n-4*n+1 // - 6*n-4*n+1
-(-4*n)-(6*n)-5-1 = 0
4*n-6*n-5-1 = 0
-2*n-6 = 0 // + 6
-2*n = 6 // : -2
n = 6/(-2)
n = -3
n = -3
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