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(1) - 10 = 2
(2)14 - = 10
(3)17 + = 18
(4)7 + = 20
(5) - 5 = 3
(6)18 - = 7
(7) - 10 = 4
(8) - 4 = 9
(9)1 + = 11
(10)15 - = 1
(11)3 - = 1
(12) + 3 = 12
(13) - 11 = 5
(14) - 2 = 3
(15)18 - = 3
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