Students rowing boats, if each boat takes 8 people, there will be 2 more seats; if each boat takes 1 more person, you can rent one less boat. How many students are there in total?
同学们划船，如果每条船坐8人，多2个座位；如果每条船多坐1人，可以少租一条船．共有几个同学？
<gadget id="calculator">1 - 2</gadget>
<output>-1</output>

<gadget id="calculator">8 + (-1)</gadget>
<output>7</output>

<gadget id="calculator">1 - 8</gadget>
<output>-7</output>

<gadget id="calculator">8 + (-7)</gadget>
<output>1</output>

<gadget id="calculator">7 / 1</gadget>
<output>7</output>

<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<gadget id="calculator">56 - 2</gadget>
<output>54</output>

<result>54</result>