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