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-2(5x +8)(5-4x)<0 /:(-2)
(5x + 8)(5 - 4x) > 0
-1(5x + 8)(4x - 5) > 0 /*(-1)
(5x + 8)(4x - 5) < 0
-8/5 5/4
odp. x nalezy (-8/5 ; 5/4)