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n in (-oo:+oo)
(3/2)*(n-(9/2)) = 12 // - 12
(3/2)*(n-(9/2))-12 = 0
(3/2)*(n-9/2)-12 = 0
3/2*(n-9/2)-12 = 0
3/2*(n-9/2)-12 = 0
3/2*n-12-27/4 = 0
3/2*n-12-27/4 = 0
3/2*n-12-27/4 = 0 // + -12-27/4
3/2*n = -(-12-27/4) // : 3/2
n = (-(-12-27/4))/3/2
n = 2/3*(27/4+12)
n = 2/3*(27/4+12)
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