Let the regular price of each ticket be \( p \). Since the tickets are on sale for $1.50 off, the sale price of each ticket is \( p - 1.50 \).
Dea buys 6 tickets at the sale price, and her total cost is $51. We can set up the equation as follows:
\[ 6(p - 1.50) = 51 \]
Now, we will solve for \( p \):
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Distribute the 6: \[ 6p - 9 = 51 \]
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Add 9 to both sides: \[ 6p = 60 \]
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Divide both sides by 6: \[ p = 10 \]
Now we have found that the regular price of each ticket is \( p = 10 \) dollars.
To explain the answer in a sentence:
The regular price of each ticket is $10.00, as Dea's total cost for 6 tickets at a discounted price of $1.50 less than the regular price amounts to $51.