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n in (-oo:+oo)
1-((7/3)*n) < -5/9 // + -5/9
1-((7/3)*n)-(-5/9) < 0
(-7/3)*n+5/9+1 < 0
14/9-7/3*n < 0 // - 14/9
-7/3*n < -14/9 // : -7/3
n > -14/9/(-7/3)
n > 2/3
n in (2/3:+oo)
(2/3:+oo)
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