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n in (-oo:+oo)
9-7*n = 67/9 // - 67/9
9-7*n-(67/9) = 0
9-7*n-67/9 = 0
14/9-7*n = 0 // - 14/9
-7*n = -14/9 // : -7
n = -14/9/(-7)
n = 2/9
n = 2/9
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