Shipping 2,000 boxes of glass, the shipping fee for one box is 5 yuan, and if one box is damaged, the shipping fee will not be paid, and the compensation will be 40 yuan. After the shipment arrived, I received a shipping fee of 9190 yuan. How many boxes of glass were damaged?
运2000箱玻璃，一箱运费5元，损坏一箱不给运费还要赔40元．运到后，收到运费9190元，问损坏了几箱玻璃？
<gadget id="calculator">5 * 2_000</gadget>
<output>10_000</output>

<gadget id="calculator">10_000 - 9_190</gadget>
<output>810</output>

<gadget id="calculator">40 + 5</gadget>
<output>45</output>

<gadget id="calculator">810 / 45</gadget>
<output>18</output>

<result>18</result>