A number is 2.82 less than its three times, find this number.
一个数比它的3倍少2.82，求这个数．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2.82 / 2</gadget>
<output>1.41</output>

<result>1.41</result>