4x+6 < 7x-9, 4x+6-6 < 7x-9-6, 4x < 7x-15, 15 < 7x -4x, 15 < 3x, 5 < x, , 4x + 6 < 7x - 9, =4x - 7x < -9 - 6, = -3x < -15, = x > 5 :),
4x+6 < 7x-9, 4x+6-6 < 7x-9-6, 4x < 7x-15, 15 < 7x -4x, 15 < 3x, 5 < x, , 4x + 6 < 7x - 9, =4x - 7x < -9 - 6, = -3x < -15, = x > 5 :),