Students from the Young Pioneers of a certain elementary school went to the conference room for a meeting. If there are 3 people sitting on each bench, there are 7 more people. If there are 4 more people on each bench, there will be 3 more benches. Question: How many young pioneers came to the meeting room?
某小学少先队的同学到会议室开会．若每条长椅上坐3人，则多出7人．若每条长椅上多坐4人则多出3条长椅．问：到会议室开会的少先队员有多少人？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">7 + 9 + 12</gadget>
<output>28</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<result>28</result>