Answers:
<h3>Distributive Property</h3><h3>Addition Property of Equality</h3><h3>Division Property of Equality</h3>
Step-by-step explanation:
Let's solve this problem step-by step to see what we use to solve this.
<h3>Step 1: Distributive Property</h3>
3x - 9 = 12
<h3>Step 2: Addition Property of Equality</h3>
3x = 21
<h3>Step 3: Division Property of Equality</h3>
x = 7
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