Multiply a certain number by 5, add 3, divide by 7, subtract 4, the result is 5, what is the number?
某数乘以5，加上3，再除以7，减去4，结果是5，这个数是多少．
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 7</gadget>
<output>63</output>

<gadget id="calculator">63 - 3</gadget>
<output>60</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<result>12</result>