2 times the sum of a number and 3 is 16, find this number.
一个数与3的和的2倍是16，求这个数．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">16 - 6</gadget>
<output>10</output>

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

<result>5</result>