(7/13)-0.4+(6/13)-(3/5).
(7/13)-0.4+(6/13)-(3/5)．
<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">(7/13) - 0.4</gadget>
<output>0.138462</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(6/13) - (3/5)</gadget>
<output>-9/65 = around -0.138462</output>

<gadget id="calculator">0.138462 + (-9/65)</gadget>
<output>0</output>

<result>0</result>