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n in (-oo:+oo)
(1/5)*(n-2) = (1/5)*(n-4) // - (1/5)*(n-4)
(1/5)*(n-2)-((1/5)*(n-4)) = 0
(1/5)*(n-2)+(-1/5)*(n-4) = 0
1/5*(n-2)-1/5*(n-4) = 0
1/5*(n-2)-1/5*(n-4) = 0
2/5 = 0
2/5 = 0
2/5 = 0 // * 5
2 = 0
2 = 0
n belongs to the empty set
n belongs to the empty set
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