((2/7)-(3/11)+(1/13))*1001.
((2/7)-(3/11)+(1/13))*1001．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 11</gadget>
<output>3/11 = around 0.272727</output>

<gadget id="calculator">(2/7) - (3/11)</gadget>
<output>1/77 = around 0.012987</output>

<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">(1/77) + (1/13)</gadget>
<output>90/1_001 = around 0.08991</output>

<gadget id="calculator">(90/1_001) * 1_001</gadget>
<output>90</output>

<result>90</result>