15-(5+2) = 15 - 7 = 8(26-6)+20 = 20 + 20 = 4017-10+5 = 7 + 5 = 128+3-4 = 11 - 4 = 710+2-7 = 12 - 7 = 57+6-0 = 13
15-(5+2) = 15 - 7 = 8
(26-6)+20 = 20 + 20 = 40
17-10+5 = 7 + 5 = 12
8+3-4 = 11 - 4 = 7
10+2-7 = 12 - 7 = 5
7+6-0 = 13