The sum of the minuend and the subtrahend is 4.2, the sum of the minuend and the difference is 3.6, what is the minuend.
被减数与减数的和是4.2，被减数与差的和是3.6，被减数是多少．
<gadget id="calculator">4.2 + 3.6</gadget>
<output>7.8</output>

<gadget id="calculator">7.8 / 3</gadget>
<output>2.6</output>

<result>2.6</result>