(3/4)-(2/7)+(1/4)-(5/7).
(3/4)-(2/7)+(1/4)-(5/7)．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) - (2/7)</gadget>
<output>13/28 = around 0.464286</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(1/4) - (5/7)</gadget>
<output>-13/28 = around -0.464286</output>

<gadget id="calculator">(13/28) + (-13/28)</gadget>
<output>0</output>

<result>0</result>