In a subtraction formula, the minuend is (15/7), what is the sum of the minuend, the subtrahend and the difference?
在一个减法算式中，被减数是(15/7)，那么被减数、减数、差这三个数的和是多少．
<gadget id="calculator">15 / 7</gadget>
<output>15/7 = around 2.142857</output>

<gadget id="calculator">(15/7) + (15/7)</gadget>
<output>30/7 = around 4.285714</output>

<result>30/7 = around 4.285714</result>