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