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n in (-oo:+oo)
(2*n)/5-(6/7) = 40/35 // - 40/35
(2*n)/5-(6/7)-(40/35) = 0
(2*n)/5-6/7-8/7 = 0
2/5*n-2 = 0 // + 2
2/5*n = 2 // : 2/5
n = 2/2/5
n = 5
n = 5
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