If 3 times a certain number minus 5 is equal to this number plus 9, what is the number?
某数的3倍减5等于这个数加9，则这个数是多少．
<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<result>7</result>