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