How much is it to combine 163-72=91, 91/7=13 into a comprehensive formula.
把163-72=91，91/7=13合并成综合算式是多少．
<gadget id="calculator">163 - 72</gadget>
<output>91</output>

<gadget id="calculator">91 / 7</gadget>
<output>13</output>

<result>13</result>