3.5 plus 5 times x, the sum is 13.5, find x.
3.5加上x的5倍，和是13.5，求x．
<gadget id="calculator">13.5 - 3.5</gadget>
<output>10</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<result>2</result>