room is 6 meters long, 4 meters wide, and 3 meters high. If you paste wallpaper on the four walls of the room, excluding doors and windows of 7 square meters, the wallpaper is 2.5 yuan per square meter. How much is the wallpaper in total?
一个房间长6米，宽4米，高3米，如果在房间四壁贴墙纸，除去门窗7平方米，每平方米墙纸2.5元，共要多少元的墙纸？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">3 * 6</gadget>
<output>18</output>

<gadget id="calculator">12 + 18</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">60 - 7</gadget>
<output>53</output>

<gadget id="calculator">2.5 * 53</gadget>
<output>132.5</output>

<result>132.5</result>