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n in (-oo:+oo)
73/7 = 3*n-n+3/7 // - 3*n-n+3/7
n-(3*n)+73/7-(3/7) = 0
n-3*n+73/7-3/7 = 0
10-2*n = 0 // - 10
-2*n = -10 // : -2
n = -10/(-2)
n = 5
n = 5
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