7a-8+9z-9a+3z-5……………… By Admin ReiPosted on December 4, 2022 7a-8+9z-9a+3z-5……………… 7a – 8 + 9z – 9a + 3z – 5 = 7a – 9a + 9z + 3z – 8 – 5 = -2a + 12z – 13 = 2a – 12z + 13