Answer:
commutative property of addition
Explanation:
You want to know the property of arithmetic that lets you write ...
x +(-7) = -7 +x
Commutative property
The commutative property of addition lets you swap the order of operands in an addition problem. It tells you ...
a +b = b +a
Here, we have ...
a = x
b = -7
Applying the commutative property lets us write ...
x +(-7) = -7 +x
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