Final answer:
The commutative property of multiplication justifies the equation.
Step-by-step explanation:
The property that justifies the equation (2x+7)(x+3) = (x+3)(2x+7) is the commutative property of multiplication. This property states that the order of the factors does not matter when multiplying. In this case, both sides of the equation have the same factors, just in a different order. Therefore, they are equal.
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