Naughty has 7 boxes of toffee, and Xiaoxiao has 6 boxes of chocolates, worth 58 yuan in total. After two people exchange a box, the total price of the items in each person's hands is equal, how much is a box of toffee?
淘气有7盒奶糖，笑笑有6盒巧克力，共值58元．两人对换一盒后，各人手里物品的总价相等，一盒奶糖有多少．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">6 * (5/4)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">7 + (15/2)</gadget>
<output>29/2 = around 14.5</output>

<gadget id="calculator">58 / (29/2)</gadget>
<output>4</output>

<result>4</result>