Final answer:
To translate the given sentence into an equation, use the variable h to represent Helena's age and express the difference as a subtraction operation.
Step-by-step explanation:
To translate the sentence into an equation, you can use the variable h to represent Helena's age. The phrase 'the difference of Helena's age and 12' implies subtraction. Therefore, the equation would be written as: 66 = h - 12.
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