A number plus the sum of 8, then multiplied by the product of 8, then subtracting the difference of 8, and then divided by the quotient of 8, is equal to 80, then, what is this number
一个数加上8的和，再乘以8的积，再减去8的差，再除以8的商，等于80，那么，这个数是多少
<gadget id="calculator">80 * 8</gadget>
<output>640</output>

<gadget id="calculator">640 + 8</gadget>
<output>648</output>

<gadget id="calculator">648 / 8</gadget>
<output>81</output>

<gadget id="calculator">81 - 8</gadget>
<output>73</output>

<result>73</result>