A group of People's Liberation Army soldiers lined up in a three-layer hollow square has 9 more people. If an additional layer is added to the hollow part, there will be a difference of 7 people. How many people are there in this group of soldiers?
一群解放军战士排成一个三层空心方阵多出9人，如果在空心部分再增加一层，还差7人，这群战士共有多少人．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">11 - 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 3 * 4</gadget>
<output>96</output>

<gadget id="calculator">96 + 9</gadget>
<output>105</output>

<result>105</result>