What is the result of subtracting the difference of 3.6 from 4.2 times 3 and adding 0.7?
3的4.2倍减去3.6的差，再加上0.7，结果是多少？
<gadget id="calculator">3 * 4.2</gadget>
<output>12.6</output>

<gadget id="calculator">12.6 - 3.6</gadget>
<output>9</output>

<gadget id="calculator">9 + 0.7</gadget>
<output>9.7</output>

<result>9.7</result>