6-7+(-3)
= -1 +(-3)
= -1 -3 = -4
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3+6+5+7+(9-7)=23
The value of n is 3, by the commutative property.
58.
9 + 8 + 7 + 6 + 5 + 4 + 3 = 42
144 (square the first value and add the product of the two values). In the statement 7 + 6 should = 91, not 63, which would be 7 + 2.