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