Given the task definition and input, reply with output. You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Context: Carol was sending out birthday invitations to her friends. Each package of invitations she bought had 10 invitations in it and she bought 7 packs. If she sends invitations to only 2 friends

Question: How many invitations will be left?
68