3.5 plus 7 times x, the sum is 14, find x.
3.5加上x的7倍，和是14，求x．
<gadget id="calculator">3.5 + 7</gadget>
<output>10.5</output>

<gadget id="calculator">10.5 / 7</gadget>
<output>1.5</output>

<result>1.5</result>