Who here is in 7th grade

I’m stuck on this i don’t understand.

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?