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7+2=9
7 + 5 + 4 ÷ 2 + 7 = 21
5 + 2 + 3 + 7 + (21/7) = 20
2 + 12 + 7 = 21
No. 2 + 7 - 8 = 1 8 + 7 - 2 = 13
7
It is: 12+7+2 = 21
-2 + (-6) + 7 = -1
-16 + -2 + 7 = -11
Commutative property of addition. :)
The commutative property
It is plus 2,