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n in (-oo:+oo)
(2*n)/5 = 4/6 // - 4/6
(2*n)/5-(4/6) = 0
(2*n)/5-2/3 = 0
2/5*n-2/3 = 0 // + 2/3
2/5*n = 2/3 // : 2/5
n = 2/3/2/5
n = 5/3
n = 5/3
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