Using 3, 3, 8, 9 to form a formula with a result of 24 can be 3*(8-3)+9=24, please use 3, 3, 7, 7 to form a formula so that the result is also twenty four.
用3，3，8，9四个数组成结果为24的一个算式可以是3*(8-3)+9=24，请你用3，3，7，7组成一个算式，使结果也为24．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) + 3</gadget>
<output>24/7 = around 3.428571</output>

<gadget id="calculator">7 * (24/7)</gadget>
<output>24</output>

<result>24</result>