6.2 times x plus the product of x and 0.6, the sum is 20.4, what is x?
x的6.2倍加上x与0.6的积，和是20.4，x是多少？
<gadget id="calculator">6.2 + 0.6</gadget>
<output>6.8</output>

<gadget id="calculator">20.4 / 6.8</gadget>
<output>3</output>

<result>3</result>