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n in (-oo:+oo)
(2*n)/5-(2/7) = 18/35 // - 18/35
(2*n)/5-(2/7)-(18/35) = 0
(2*n)/5-2/7-18/35 = 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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