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c in (-oo:+oo)
(4/11)*c-(5/13) < 3 // - 3
(4/11)*c-(5/13)-3 < 0
(4/11)*c-5/13-3 < 0
4/11*c-44/13 < 0 // + 44/13
4/11*c < 44/13 // : 4/11
c < 44/13/4/11
c < 121/13
c in (-oo:121/13)
(-oo:121/13)
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