In a subtraction formula, the sum of the minuend, the subtrahend, and the difference is 9.68, and the difference is 3.2. What is the subtrahend?
在一道减法算式中，被减数、减数、差的和是9.68，差是3.2，减数是多少
<gadget id="calculator">9.68 / 2</gadget>
<output>4.84</output>

<gadget id="calculator">4.84 - 3.2</gadget>
<output>1.64</output>

<result>1.64</result>