A pile of coal is transported, (5/6) tons are removed for the first time, (8/9) tons are removed for the second time, and (3/4) tons are left, how many tons is this pile of coal originally?
运一堆煤，第一次运走(5/6)吨，第二次运走(8/9)吨，还剩(3/4)吨，这堆煤原有多少吨？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

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

<gadget id="calculator">(5/6) + (8/9) + (3/4)</gadget>
<output>89/36 = around 2.472222</output>

<result>89/36 = around 2.472222</result>