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n in (-oo:+oo)
n+n-(5/6)+3/7 = 11/21 // - 11/21
n+n-(5/6)+3/7-(11/21) = 0
n+n-5/6+3/7-11/21 = 0
2*n-13/14 = 0 // + 13/14
2*n = 13/14 // : 2
n = 13/14/2
n = 13/28
n = 13/28
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