It's D. . Why? . Ok, your variable is x. . x stands for WHAT( the VALUE ) that you want to find. . So, assume you know what x is. . Pretend it's 10 or like infinity or what-not. . So, x + $32.25 = $45.32. . But you don't know x. . But it's easy to find it. . Subtract $32.25 on both sides, and BOOM!! . Hope this helped!. . Any question, ASK AWAY!!