Two minus ones is minus two.
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if you add 1+1 it = 2 get it :D
If you add 0.39 to 0.61 you get 1
1 and a half add 1 and two thirds = 2
add 9 add 1 subtract 20 add 9 add 1
12, 13, 16 Add three, then add 1, then add three, then add 1, and so on so forth