2.5 times of a number is 14 less than 6 times of this number. Find this number.
一个数的2.5倍比这个数的6倍少14，求这个数．
<gadget id="calculator">6 - 2.5</gadget>
<output>3.5</output>

<gadget id="calculator">14 / 3.5</gadget>
<output>4</output>

<result>4</result>