Need help with this math problem...

Answer:
5x=$105
Each ticket costs $21.
Step-by-step explanation:
1). Since he bought 5 tickets and he paid $105 your equation will look like this(keep in mid your x is = tickets so your equation is basically saying he bought 5 tickets for $105):
5x = 105
2). You divide by 5 and you get x =21.