A rope, (1/6) meter was used for the first time, (2/3) meter was used for the second time, and (3/4) meter is left. How long is this rope?
一根绳子，第一次用去了(1/6)米，第二次用去了(2/3)米，还剩下(3/4)米．这根绳子原来长多少米？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/6) + (2/3) + (3/4)</gadget>
<output>19/12 = around 1.583333</output>

<result>19/12 = around 1.583333</result>