The school bought back 7 volleyballs and 8 basketballs for a total of 1296 yuan. It is known that a volleyball is 12 yuan cheaper than a basketball, how much is a volleyball? Use two methods of solving equations and calculating formulas.
学校买回7只排球和8只篮球，共用去1296元．已知一只排球比一只篮球便宜12元，求一只排球多少元．使用解方程和算式两种方法．
<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">1_296 - 96</gadget>
<output>1_200</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">1_200 / 15</gadget>
<output>80</output>

<result>80</result>