Correction :

26 - 4 = 22	5 - 4 = 1
36 - 20 = 16	23 - 7 = 16
2 + 5 = 7	20 + 19 = 39
6 + 24 = 30	15 + 0 = 15
18 - 6 = 12	31 - 10 = 21
21 + 22 = 43	2 + 8 = 10
36 - 22 = 14	19 - 9 = 10
23 + 15 = 38	16 - 6 = 10
14 + 13 = 27	8 + 17 = 25
23 - 8 = 15	36 - 19 = 17