After using a 120cm long iron wire to make a rectangular frame with a length of 8cm, a width of 7cm and a height of 6cm, how many centimeters are left? (regardless of connectors)
用一根长120cm的铁丝，做一个长8cm、宽7cm、高6cm的长方形框架后，还剩多少厘米？(不考虑接头)
<gadget id="calculator">8 + 7 + 6</gadget>
<output>21</output>

<gadget id="calculator">21 * 4</gadget>
<output>84</output>

<gadget id="calculator">120 - 84</gadget>
<output>36</output>

<result>36</result>