解;9-4 (X-5) < 7X+4 9-4x+20 < 7X+4 29-4< 7X+4x 25< 11x x>25/11
9-4X+5<7X+410<3XX>10/3
拆项,之后移项,系数化为一
9-4x+20<7x+4即25<11x x>25/11
9-4 (X-5) < 7X+4 9-4x+20<7x+425<11x x>25/11