AudriT457015go AudriT457015go Mathematics Answered 9) (1 - 6x) + (7x + 3)10) (-4x + 4) – (8x + 7)11) (-x - 3) + (3x + 8)12) (7 + a)-(-7a + 1)14) (-3k - 1) + (7 + 2k)