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n in (-oo:+oo)
9 = 6*n-2*n+5 // - 6*n-2*n+5
9-(-2*n)-(6*n)-5 = 0
2*n-6*n-5+9 = 0
4-4*n = 0 // - 4
-4*n = -4 // : -4
n = -4/(-4)
n = 1
n = 1
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