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n in (-oo:+oo)
2*n-(6*n)-9 = -13 // + 13
2*n-(6*n)-9+13 = 0
2*n-6*n-9+13 = 0
4-4*n = 0 // - 4
-4*n = -4 // : -4
n = -4/(-4)
n = 1
n = 1
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