1 Answer

Boom · Answer 1 · 2021-10-22T01:18:49+0000

Answer:

a+9=9+a

Explanation:

Let
$a,b\in \mathbb R$ then the commutative property of addition states that:

a+b=b+a

This means that the order in which we add any two real numbers does not matter.

This implies that
9+a completes the given statement

a+9=9+a

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