In the subtraction formula, the subtrahend is (3/14), the other subtrahend is (5/14), the difference is (4/14), what is the minuend?
减法算式中，减数是(3/14)，另一个减数是(5/14)，差是(4/14)，被减数是多少？
<gadget id="calculator">3 / 14</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">5 / 14</gadget>
<output>5/14 = around 0.357143</output>

<gadget id="calculator">4 / 14</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(3/14) + (5/14) + (2/7)</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>