The wall on the right side of the computer room is 9 meters long and 6 meters wide. There are 3 windows on the wall. The area of each window is 5 square meters. Now this wall needs to be painted, what is the area to be painted?
电脑室右面的墙壁，长9米，宽6米，墙上有3扇窗户，每扇窗户的面积是5平方米，现在要粉刷这面墙壁，要粉刷的面积是多少？
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">54 - 15</gadget>
<output>39</output>

<result>39</result>