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n in (-oo:+oo)
n+n-(3/4)+5/7 = 5/14 // - 5/14
n+n-(3/4)+5/7-(5/14) = 0
n+n-3/4+5/7-5/14 = 0
2*n-11/28 = 0 // + 11/28
2*n = 11/28 // : 2
n = 11/28/2
n = 11/56
n = 11/56
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