The two outer terms are x and 2.5, and the two inner terms are 100 and 0.8. Find the value of x.
两个外项分别是x和2.5，两个内项分别是100和0.8．求x的值．
<gadget id="calculator">100 * 0.8</gadget>
<output>80</output>

<gadget id="calculator">80 / 2.5</gadget>
<output>32</output>

<result>32</result>