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n in (-oo:+oo)
2*(9-6*n) = -6 // + 6
2*(9-6*n)+6 = 0
2*(9-6*n)+6 = 0
24-12*n = 0
24-12*n = 0
24-12*n = 0 // - 24
-12*n = -24 // : -12
n = -24/(-12)
n = 2
n = 2
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