(9-3)+9 = 6 + 9 = 15(10-2)-8 = 8 - 8 = 0(15-9)-4 = 6 - 4 = 2(17-6)-2 = 11 - 2 = 97+(9-4) = 7 + 5 = 129+(12-5) = 9 + 7 = 1617-(6+2) = 17 - 8 = 915-(1+7) = 15 - 8 = 715-(9+4) = 15 - 13 = 2
(9-3)+9 = 6 + 9 = 15
(10-2)-8 = 8 - 8 = 0
(15-9)-4 = 6 - 4 = 2
(17-6)-2 = 11 - 2 = 9
7+(9-4) = 7 + 5 = 12
9+(12-5) = 9 + 7 = 16
17-(6+2) = 17 - 8 = 9
15-(1+7) = 15 - 8 = 7
15-(9+4) = 15 - 13 = 2