Subtract the product of 4 and 3 from twice x, the difference is 10, find x.
x的2倍减去4与3的积，差是10，求x．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">10 + 12</gadget>
<output>22</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<result>11</result>