(3/8)*(4/7)+(4/7)*(13/8)-(4/7).
(3/8)*(4/7)+(4/7)*(13/8)-(4/7)．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(3/8) * (4/7)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">13 / 8</gadget>
<output>13/8 = around 1.625</output>

<gadget id="calculator">(4/7) * (13/8)</gadget>
<output>13/14 = around 0.928571</output>

<gadget id="calculator">(13/14) - (4/7)</gadget>
<output>5/14 = around 0.357143</output>

<gadget id="calculator">(3/14) + (5/14)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>