I need help with this math. please explain

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

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.

Pls brainliest will be awarded if answer is correct