Solution ratio: (3.8-x): 7=14:5.
解比例：(3.8-x)：7=14：5．
<gadget id="calculator">7 * 14</gadget>
<output>98</output>

<gadget id="calculator">98 - 19</gadget>
<output>79</output>

<gadget id="calculator">79 / 5</gadget>
<output>79/5 = around 15.8</output>

<result>79/5 = around 15.8</result>