transport team contracted to transport 1998 sets of glass tea sets. The transportation contract stipulates that the shipping fee for each set of tea sets is 1.6 yuan. For every damaged set of tea sets, not only the shipping fee will not be paid, but the compensation fee of 18 yuan will be deducted from the total cost. As a result, the transportation team actually received a shipping fee of 3059.6 yuan. Then, how many sets of tea sets were damaged in the transportation process.
一个运输队承包运输1998套玻璃茶具．运输合同规定：每套茶具运费1.6元，每损坏一套茶具，不仅不得运费，还要从总费中扣除赔偿费18元．结果这个运输队实际得到运费3059.6元，那么，在运输过程中一共损坏了多少套茶具．
<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>