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n in (-oo:+oo)
5-(2*n) = (5/6)*n+28/9 // - (5/6)*n+28/9
5-(2*n)-((5/6)*n)-(28/9) = 0
(-5/6)*n-2*n-28/9+5 = 0
17/9-17/6*n = 0 // - 17/9
-17/6*n = -17/9 // : -17/6
n = -17/9/(-17/6)
n = 2/3
n = 2/3
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