There is a wire, cut off (1/3) for the first time, and cut off (7/3) meters for the second time, leaving (1/5), how many meters was the original length of this wire?
有一根电线，第一次剪去(1/3)，第二次剪去(7/3)米，还剩下(1/5)，这根电线原长多少米？
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">1 - (8/15)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(7/3) / (7/15)</gadget>
<output>5</output>

<result>5</result>