A glass factory entrusts a transportation company to transport 2,000 pieces of glass. The transportation fee for each piece is 0.4 yuan. If one piece is damaged, the compensation is 7 yuan. As a result, the transportation company has to pay 711.2 yuan for transportation. How many pieces of glass did the transportation company lose?
某玻璃厂委托运输公司运2000块玻璃，每块运输费是0.4元，如损坏一块要赔偿7元，结果运输公司得运费711.2元，求运输公司损失玻璃多少块？
<gadget id="calculator">2_000 * 0.4</gadget>
<output>800</output>

<gadget id="calculator">800 - 711.2</gadget>
<output>88.8</output>

<gadget id="calculator">7 + 0.4</gadget>
<output>7.4</output>

<gadget id="calculator">88.8 / 7.4</gadget>
<output>12</output>

<result>12</result>