What is the number that is 5.8 larger than the original number after being tripled?
一个数扩大3倍后比原数大5.8，这个数是多少．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">5.8 / 2</gadget>
<output>2.9</output>

<result>2.9</result>