Can someone please give me the answer

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Me find the value of x each figure.