Mr. Zhang bought 1 football and 3 basketballs for 360 yuan, and Mr. Li bought the same 1 football and 7 basketballs for 696 yuan. How much is a basketball?
张老师买了1个足球和3个篮球用了360元，李老师买了同样的1个足球和7个篮球用了696元．一个篮球多少元？
<gadget id="calculator">696 - 360</gadget>
<output>336</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">336 / 4</gadget>
<output>84</output>

<result>84</result>