What property is used when solving 6x=72

1) Addition property of equality

2) Multiplication property of equality

3) Distributive property

4) Commutative property

Sorry to bother you all with what might seem like a simple conversion problem, but I have tons of HW to do, and math is absolutely NOT my area of expertise. So, have at it, you math-wizards. A full explanation would be greatly appreciated, too.

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