Add 5 to a number, subtract 3, multiply by 2, divide by 4, and the result is 6. What is this number?
把一个数加上5，减去3，乘以2，除以4，结果是6．这个数是多少．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">3 - 5</gadget>
<output>-2</output>

<gadget id="calculator">12 + (-2)</gadget>
<output>10</output>

<result>10</result>