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n in (-oo:+oo)
4*(9-3*n) = -108 // + 108
4*(9-3*n)+108 = 0
4*(9-3*n)+108 = 0
144-12*n = 0
144-12*n = 0
144-12*n = 0 // - 144
-12*n = -144 // : -12
n = -144/(-12)
n = 12
n = 12
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