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n in (-oo:+oo)
(2*n)/21 = 8/35 // - 8/35
(2*n)/21-(8/35) = 0
(2*n)/21-8/35 = 0
2/21*n-8/35 = 0 // + 8/35
2/21*n = 8/35 // : 2/21
n = 8/35/2/21
n = 12/5
n = 12/5
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