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n in (-oo:+oo)
14*n-(3*(2*n+6))-n+12 = (1/2)*(4*n-36) // - (1/2)*(4*n-36)
14*n-(3*(2*n+6))-((1/2)*(4*n-36))-n+12 = 0
(-1/2)*(4*n-36)-3*(2*n+6)+14*n-n+12 = 0
14*n-3*(2*n+6)-1/2*(4*n-36)-n+12 = 0
14*n-3*(2*n+6)-1/2*(4*n-36)-n+12 = 0
14*n-8*n-n+12 = 0
6*n-n+12 = 0
5*n+12 = 0
5*n+12 = 0
5*n+12 = 0 // - 12
5*n = -12 // : 5
n = -12/5
n = -12/5
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