Li Gang transported honeycomb briquettes to Grandma Wang, a member of the army. The first time he transported all (3/8), the second time he transported 50 yuan. At this time, what has been shipped happens to be what has not been shipped (5/7). How many briquettes have not yet been shipped.
李刚给军属王奶奶运蜂窝煤，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)．还有多少块蜂窝煤没有运来．
<gadget id="calculator">5 + 7</gadget>
<output>12</output>

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

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

<gadget id="calculator">(5/12) - (3/8)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">50 / (1/24)</gadget>
<output>1_200</output>

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

<gadget id="calculator">1_200 * (7/12)</gadget>
<output>700</output>

<result>700</result>