Add I 5a 3b 2b 3a 5b

Add : (i) 5a + 3b, a – 2b, 3a + 5b (ii) 8x – 3y + 7z, -4x + 5y – 4z, -x – y – 2z (iii … 10a (viii) 2ax – 6by + 4cz, 4by – 14ax,…