Let \( p \) represent the regular price of each ticket. The discounted price of each ticket is \( p - 1.50 \). Since Dea buys 6 tickets for a total cost of $51, we can set up the equation:
\[ 6(p - 1.50) = 51 \]
Now, let's solve the equation:
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Distribute 6: \[ 6p - 9 = 51 \]
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Add 9 to both sides: \[ 6p = 60 \]
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Divide both sides by 6: \[ p = 10 \]
Thus, the regular price of each ticket is $10.
In conclusion, the regular price of each ticket is $10, which indicates that with the discount applied, Dea was able to purchase 6 tickets for a total of $51.