The sum of 5 consecutive natural numbers is 12 more than 3 times its middle number. What is the largest of these 5 natural numbers?
5个连续的自然数的和比它中间数的3倍多12，这5个自然数中最大的是多少．
<gadget id="calculator">12 - 1 - 2</gadget>
<output>9</output>

<gadget id="calculator">1 + 2 + 9</gadget>
<output>12</output>

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

<gadget id="calculator">1 + 1 + 1 + 1 + (-2)</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<result>8</result>