2.8 times a number minus 12, the difference is 12, how to find this number? (column equation solution)
一个数的2.8倍减去12，差是12，求这个数？(列方程解答)
<gadget id="calculator">12 + 12</gadget>
<output>24</output>

<gadget id="calculator">24 / 2.8</gadget>
<output>8.571429</output>

<result>8.571429</result>