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3 | 5-2x | -2 < 19 13-4 | 7x -40 | < 5
= 15-6x-2 < 1708x-9760 < 5
= -6x-1708x < -9760-13-5 < 0
= -1714x < -9778 < 0
= x > -9778/-1714 < 0
= x > 5 1208/1714 < 0