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To determine the missing step using the Commutative Property, we need to rearrange the terms in the expression \(12a + 10 + a\).
The missing step is:
**Step 1:** \(10 + 12a + a = 10 + a + 12a\)
So the correct response is:
**10 + 12a + a = 10 + a + 12a**
This step uses the Commutative Property to arrange the terms in a new order.