Not exactly.  The correct answer is 156.  To solve that problem you need to add 12 to both sides of the equation.

Good news is that you can skip Volumes 1 and 2 and start with Volume 3.  That book will teach you how to solve for x quickly and easily.  You already have a solid foundation in math, so you can probably finish that book in about a month.  Use coupon code PT2026 to get 10% off your order.