0
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twenty one (21) is the sum of 12 and 9.
3 and 9 Difference: 9-3=6 Sum: 9+3=12
9 x 3 = 27 9 + 3 = 12
9
12
29.
It is: 12+9 = 21
9+12 = 21
9 + 12 = 21
-6
21
3 + 9 = 12
The expression is -9 + 13 + 12