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