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n in (-oo:+oo)
5*(9-6*n) = -15 // + 15
5*(9-6*n)+15 = 0
5*(9-6*n)+15 = 0
60-30*n = 0
60-30*n = 0
60-30*n = 0 // - 60
-30*n = -60 // : -30
n = -60/(-30)
n = 2
n = 2
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