"Many students bought prom tickets in advance for $2 each. Other students bought tickets at the door for $5 each. In all, 127 students attended the dance and $500 was the total for all tickets sales. How many students bought advanced tickets?"

I need help with getting started with the problem. I don't know which parts of the word problem I need to put into an equation and I also have to use substitution. Please help.

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