There is a bundle of iron wire, half of the total length and 1.5 meters are used for the first time, the remaining half and 1.5 meters are used for the second time, and the remaining half and 3 meters are used for the third time, which is just used up. How long is this bundle of wire?
有一捆铁丝，第一次用去全长的一半又1.5米，第二次用去余下的一半又1.5米，第三次用去了余下的一半又3米，正好用完．这捆铁丝长多少米？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 1.5</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 * 2</gadget>
<output>15</output>

<gadget id="calculator">15 + 1.5</gadget>
<output>16.5</output>

<gadget id="calculator">16.5 * 2</gadget>
<output>33</output>

<result>33</result>