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n in (-oo:+oo)
(3*n)/7 = 4/5 // - 4/5
(3*n)/7-(4/5) = 0
(3*n)/7-4/5 = 0
3/7*n-4/5 = 0 // + 4/5
3/7*n = 4/5 // : 3/7
n = 4/5/3/7
n = 28/15
n = 28/15
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