A transport team shipped 1998 sets of glass tea sets. The transportation contract stipulates that the freight for each set is calculated at 1.6 yuan, and for every damaged set, not only the freight will not be paid, but the compensation fee of 18 yuan will be deducted from the total cost. As a result, the actual shipping fee for this team was 3059.6 yuan. How many tea sets were damaged in transit?
一个运输队包运1998套玻璃茶具．运输合同规定：每套运费以1.6元计算，每损坏一套，不仅不得运费，还要从总费中扣除赔偿费18元．结果这个队实际得运费3059.6元．在运输过程中被损坏的茶具套数是多少？
<gadget id="calculator">1_998 * 1.6</gadget>
<output>3_196.8</output>

<gadget id="calculator">3_196.8 - 3_059.6</gadget>
<output>137.2</output>

<gadget id="calculator">18 + 1.6</gadget>
<output>19.6</output>

<gadget id="calculator">137.2 / 19.6</gadget>
<output>7</output>

<result>7</result>