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n in (-oo:+oo)
12*(1-(n/5)) = 2.4 // - 2.4
12*(1-(n/5))-2.4 = 0
12*(1-1/5*n)-2.4 = 0
12*(1-1/5*n)-2.4 = 0
9.6-12/5*n = 0
9.6-12/5*n = 0
9.6-12/5*n = 0 // - 9.6
-12/5*n = -9.6 // : -12/5
n = -9.6/(-12/5)
n = 4
n = 4
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