In a subtraction formula, the subtrahend is 50% of the difference. It is known that the sum of the minuend, the subtrahend and the difference is 8. What is the difference?
在一个减法算式中，减数是差的50%，已知被减数、减数和差的和是8，差是多少．
<gadget id="calculator">8 / 3</gadget>
<output>8/3 = around 2.666667</output>

<result>8/3 = around 2.666667</result>