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n in (-oo:+oo)
(1/2)*(2*n+6) = 5-n-12 // - 5-n-12
(1/2)*(2*n+6)+n-5+12 = 0
1/2*(2*n+6)+n-5+12 = 0
1/2*(2*n+6)+n-5+12 = 0
2*n-5+3+12 = 0
2*n-2+12 = 0
2*n+10 = 0
2*n+10 = 0
2*n+10 = 0 // - 10
2*n = -10 // : 2
n = -10/2
n = -5
n = -5
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