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n in (-oo:+oo)
3*(n+4) = n/2-8 // - n/2-8
3*(n+4)-(n/2)+8 = 0
3*(n+4)-n/2+8 = 0
(2*3*(n+4))/2-n/2+(2*8)/2 = 0
2*3*(n+4)-n+2*8 = 0
5*n+16+24 = 0
5*n+40 = 0
(5*n+40)/2 = 0
(5*n+40)/2 = 0 // * 2
5*n+40 = 0
5*n+40 = 0 // - 40
5*n = -40 // : 5
n = -40/5
n = -8
n = -8
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