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n in (-oo:+oo)
(3/5)*n-(4/5) = (1/5)*n // - (1/5)*n
(3/5)*n-((1/5)*n)-(4/5) = 0
(3/5)*n+(-1/5)*n-4/5 = 0
2/5*n-4/5 = 0 // + 4/5
2/5*n = 4/5 // : 2/5
n = 4/5/2/5
n = 2
n = 2
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