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n in (-oo:+oo)
(2*n)/7 = 3/14 // - 3/14
(2*n)/7-(3/14) = 0
(2*n)/7-3/14 = 0
2/7*n-3/14 = 0 // + 3/14
2/7*n = 3/14 // : 2/7
n = 3/14/2/7
n = 3/4
n = 3/4
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