$(- 5) + (- 8) = (- 8) + (___)$

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Solution

Fill in the blank.
The given expression is $(- 5) + (- 8) = (- 8) + (___)$ .
We know that “Addition is commutative for integers”.
Therefore, according to the commutative property under addition, for any two integers $a$ and $b$ , we can say
$a + b = b + a$
Let $a = - 5$ and $b = - 8$ .
Substitute these values in the equation $a + b = b + a$ :
$(- 5) + (- 8) = (- 8) + (- 5)$
Hence, the number in the blank is $- 5$ .

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