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Step 1: Distribute the -8 to both terms inside the parentheses: 7f + 18 - 8(3) + 8f
Property used: Distributive Property
Step 2: Combine like terms: 7f + 18 - 24 + 8f
Property used: Commutative Property
Step 3: Simplify the expression: 15f - 6
Therefore, Gloria used the Distributive Property and the Commutative Property to find the equivalent expression 15f - 6 in simplest form.