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n in (-oo:+oo)
57/14 = (-5/6)*n+(5/7)*n+3 // - (-5/6)*n+(5/7)*n+3
57/14-((-5/6)*n)-((5/7)*n)-3 = 0
(5/6)*n+(-5/7)*n+57/14-3 = 0
5/42*n+15/14 = 0 // - 15/14
5/42*n = -15/14 // : 5/42
n = -15/14/5/42
n = -9
n = -9
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