If the former term of 2:3 is increased by 6, how much is the latter term required to keep the ratio unchanged?
若2：3的前项增加6，要使比值不变，后项要多少
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<result>9</result>