Fill in the appropriate number in □ to make the equation established 73.06-□*(2.357+7.643)-42.06=13 then □=how much.
在□里填上适当的数，使等式成立73.06-□*(2.357+7.643)-42.06=13则□=多少．
<gadget id="calculator">73.06 - 42.06 - 13</gadget>
<output>18</output>

<gadget id="calculator">2.357 + 7.643</gadget>
<output>10</output>

<gadget id="calculator">18 / 10</gadget>
<output>9/5 = around 1.8</output>

<result>9/5 = around 1.8</result>