Final answer:
To translate the sentence into an equation, use 5(x + 3) = 9 as the equation.
Step-by-step explanation:
To translate the sentence into an equation, we need to identify the unknown number. Let's use the variable x for the unknown number. The sum of a number and 3 can be represented as (x + 3). Five times the sum of a number and 3 is equal to 9 can be written as 5(x + 3) = 9.
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