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n in (-oo:+oo)
12*(1-(n/5)) = 24 // - 24
12*(1-(n/5))-24 = 0
12*(1-1/5*n)-24 = 0
12*(1-1/5*n)-24 = 0
-12/5*n-12 = 0
-12/5*n-12 = 0
-12/5*n-12 = 0 // + 12
-12/5*n = 12 // : -12/5
n = 12/(-12/5)
n = -5
n = -5
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