Four 0.6s are 0.6 more than twice a number. Find this number? (column equation solution)
4个0.6比一个数的2倍多0.6，求这个数？(列方程解答)
<gadget id="calculator">4 * 0.6</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 - 0.6</gadget>
<output>1.8</output>

<gadget id="calculator">1.8 / 2</gadget>
<output>0.9</output>

<result>0.9</result>