7 2/5 - 6 7/8 = 3/4 - 1/15 = 12 * 2/9 - 12 * 2 2/27 = 7 * 3/5 - 4 * 3/5 =

a) 7 2/5 - 6 7/8 = 37/5 - 55/8 = 296/40 - 275/40 = 21/40b) 3/4 - 1/15 = 45/60 - 4/60 = 41/60 c) 12 * 2/9 - 12 * 2 2/27 = 24/9 - 12 * 56/27 = 24/9 - 672/27 = 72/27 - 672/72 = -600/27 = -22 i 6/27 = -22 i 2/9 d) 7 * 3/5 - 4 * 3/5 = 38/5 - 23/5 = 15/5 = 3