5 times a number minus this number equals 6.8, what is this number?
一个数的5倍减去这个数等于6.8，这个数是多少．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">6.8 / 4</gadget>
<output>1.7</output>

<result>1.7</result>