Xiaogang transported honeycomb coal to Grandma Wang, the first time he transported all of it (3/8), and the second time he transported 50 yuan. At this time, the ones that have been transported happened to be the ones that did not arrive (5/7). How many briquettes have not been shipped?
小刚给王奶奶运蜂窝煤，第一次运了全部的(3/8)，第二次运了50块，这时已运来的恰好是没运来的(5/7)，问还有多少块蜂窝煤没有运来？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(7/12) - (3/8)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">50 / (5/24)</gadget>
<output>240</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">240 * (5/12)</gadget>
<output>100</output>

<result>100</result>