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n in (-oo:+oo)
12*(1-(n/5)) = 0
12*(1-1/5*n) = 0
( 1-1/5*n )
1-1/5*n = 0 // - 1
-1/5*n = -1 // : -1/5
n = -1/(-1/5)
n = 5
( 12 )
12 = 0
n belongs to the empty set
n = 5
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