Uncle Wang wants to paint the walls of a classroom with a length of 7.5 meters, a width of 7 meters, and a height of 3.6 meters (the ceiling is not painted), and the area of doors and windows is 5.5 square meters. Find the area that needs to be painted.
王叔叔要粉刷一个长为7.5米，宽7米，高3.6米的教室的墙壁(天花板不刷)，扣除门窗的面积5.5平方米，求需要粉刷的面积．
<gadget id="calculator">7.5 * 3.6</gadget>
<output>27</output>

<gadget id="calculator">7 * 3.6</gadget>
<output>25.2</output>

<gadget id="calculator">27 + 25.2</gadget>
<output>52.2</output>

<gadget id="calculator">52.2 * 2</gadget>
<output>104.4</output>

<gadget id="calculator">104.4 - 5.5</gadget>
<output>98.9</output>

<result>98.9</result>