Answer:
Xavier has 5 dollars
Step-by-step explanation:
2x represents how much money Alex had, the -3 is how much he spent, and the 7 is how much he has now

Add 3 to both sides

divide both sides by 2

Checking my work:

It actually depends
One person is $6
Parking is $12
If you want to count the price for one person it is $6
If you want to count the price plus PARKING it would be $18