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n in (-oo:+oo)
(5/6)*n-(1/5) < -8/15 // + -8/15
(5/6)*n-(1/5)-(-8/15) < 0
(5/6)*n-1/5+8/15 < 0
5/6*n+1/3 < 0 // - 1/3
5/6*n < -1/3 // : 5/6
n < -1/3/5/6
n < -2/5
n in (-oo:-2/5)
(-oo:-2/5)
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